Comparative sizes between the known members of the ceratopsian family Protoceratopsidae:
<ul><li><i>Bagaceratops rozhdestvenskyi </i> → Bayan Mandahu &amp; Barun Goyot formations. Length = 1-2 (here 1.7) meters.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1">[1]</a></sup><sup id="cite_ref-2" class="reference"><a href="#cite_note-2">[2]</a></sup></li>
<li><i>Breviceratops kozlowskii</i> → Barun Goyot Formation. Length = ~20 centimeters.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3">[3]</a></sup></li>
<li><i>Protoceratops andrewsi</i> → Djadokhta Formation. Length = 2 meters.<sup id="cite_ref-Holtz_4-0" class="reference"><a href="#cite_note-Holtz-4">[4]</a></sup><sup id="cite_ref-Paul20116_5-0" class="reference"><a href="#cite_note-Paul20116-5">[5]</a></sup></li>
<li><i>Protoceratops hellenikorhinus</i> → Bayan Mandahu Formation. Length = 2 meters.<sup id="cite_ref-Holtz_4-1" class="reference"><a href="#cite_note-Holtz-4">[4]</a></sup><sup id="cite_ref-Paul20116_5-1" class="reference"><a href="#cite_note-Paul20116-5">[5]</a></sup></li></ul><h4><span class="mw-headline" id="References">References</span></h4>
<ol class="references"><li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><cite style="font-style:normal"> (2008). "<a rel="nofollow" class="external text" href="https://www.researchgate.net/publication/226432157">Adaptive Features of Protoceratopsids (Ornithischia: Neoceratopsia)</a>". <i>Paleontological Journal</i> <b>42</b> (3): 50−64. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1134/S003103010803009X">10.1134/S003103010803009X</a>.</cite></span>
</li>
<li id="cite_note-2"><span class="mw-cite-backlink"><a href="#cite_ref-2">↑</a></span> <span class="reference-text"><cite style="font-style:normal"> (2019). "<a rel="nofollow" class="external text" href="http://www.jgsk.or.kr/_common/do.php?a=current&amp;b=21&amp;bidx=1526&amp;aidx=19356#JGSK_2019_v55n2_179_B19">The postcranial skeleton of Bagaceratops (Ornithischia: Neoceratopsia) from the Baruungoyot Formation (Upper Cretaceous) in Hermiin Tsav of southwestern Gobi, Mongolia</a>". <i>Journal of the Geological Society of Korea</i> <b>55</b>: 179−190. <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.14770/jgsk.2019.55.2.179">10.14770/jgsk.2019.55.2.179</a>.</cite></span>
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<li id="cite_note-3"><span class="mw-cite-backlink"><a href="#cite_ref-3">↑</a></span> <span class="reference-text"><cite style="font-style:normal"> (1975). "<a rel="nofollow" class="external text" href="http://palaeontologia.pan.pl/Archive/1975-33_133-181_36-50.pdf">Protoceratopsidae (Dinosauria) of Asia</a>". <i>Palaeontologia Polonica</i> <b>33</b>: 134−143.</cite></span>
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<li id="cite_note-Holtz-4"><span class="mw-cite-backlink">↑ <a href="#cite_ref-Holtz_4-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Holtz_4-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="book" style="font-style:normal">(2007) <i> Dinosaurs: The Most Complete, Up-to-Date Encyclopedia for Dinosaur Lovers of All Ages</i>, Random House  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/9780375824197" title="Special:BookSources/9780375824197">9780375824197</a>. </small></cite> <a rel="nofollow" class="external text" href="https://www.geol.umd.edu/~tholtz/dinoappendix/HoltzappendixWinter2011.pdf">Genus List for Holtz 2012</a>  <a rel="nofollow" class="external text" href="https://www.geol.umd.edu/~tholtz/dinoappendix/appendix.html">Weight Information</a></span>
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<li id="cite_note-Paul20116-5"><span class="mw-cite-backlink">↑ <a href="#cite_ref-Paul20116_5-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-Paul20116_5-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><cite class="book" style="font-style:normal">(2016) <i> The Princeton Field Guide to Dinosaurs</i> (2nd ed.), <a href="https://en.wikipedia.org/wiki/en:Princeton,_New_Jersey" class="extiw" title="w:en:Princeton, New Jersey"><span title="municipality in Mercer County, New Jersey, United States">Princeton</span></a>:  Princeton University Press, pp. 282  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/9780691167664" title="Special:BookSources/9780691167664">9780691167664</a>. </small></cite></span>
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</ol>
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