Conventional left–right political spectrum
Anonymus
<cite class="book" style="font-style:normal">Andrew Heywood (16 February 2017)      <i> <a rel="nofollow" class="external text" href="https://books.google.com/books?id=Sy8hDgAAQBAJ&amp;pg=PA15">Political Ideologies: An Introduction</a></i> (6th ed.), Macmillan International Higher Education, pp. 15−17  <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/978-1-137-60604-4" title="Special:BookSources/978-1-137-60604-4">978-1-137-60604-4</a>. </small></cite>. OCLC 988218349