Diagram of the mechanism of early Hatha Yoga, based on the retention of Bindu, as described in <cite class="book" style="font-style:normal">James Mallinson, Mark Singleton (2017)      <i> Roots of Yoga</i>, Penguin Books, pp. 180−181  <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/978-0-241-25304-5" title="Special:BookSources/978-0-241-25304-5">978-0-241-25304-5</a>.  <a href="https://en.wikipedia.org/wiki/Online_Computer_Library_Center" class="extiw" title="en:Online Computer Library Center">OCLC</a>:   <a rel="nofollow" class="external text" href="https://www.worldcat.org/oclc/928480104">928480104</a>. </small></cite>
<a href="//commons.wikimedia.org/wiki/User:Chiswick_Chap" title="User:Chiswick Chap">Ian Alexander</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>