[[Fitxer:1896 Olympic marathon.jpg|thumb|Fotografia de Burton Holmes titulada ''"1896: Three athletes in training for the marathon at the Olympic Games in Athens"''.<ref name="m-getty">{{cite ref-web|url=http://www.gettyimages.com/detail/news-photo/three-athletes-in-training-for-the-marathon-at-the-olympic-news-photo/3066157|titletítol=1896, Marathon Runners, Burton Holmes|publishereditor=Getty Images|accessdateconsulta= 10 Maymaig 2015|archiveurlurlarxiu=https://web.archive.org/web/20120619073508/http://www.gettyimages.com/detail/news-photo/three-athletes-in-training-for-the-marathon-at-the-olympic-news-photo/3066157 |archivedatedataarxiu= 19 Junejuny 2012 |deadurl=no}}</ref><ref name="m-burtonholmes-1901">{{cite bookref-llibre|authorautor=Burton Holmes|titletítol=The Burton Holmes Lectures: The Olympian games in Athens. Grecian journeys. The wonders of Thessaly|url=https://books.google.com/books?id=Rt6fAAAAMAAJ&pg=PA69|yearany=1905|locationlloc=NewNova York|publishereditorial=McClure, Phillips & Co.|pagespàgines=69|isbn=9781276985949|accessdateconsulta= 25 Aprilabril 2015}}(Digital compilation from original title: ''The Burton Holmes Lectures (Volume 3): With Illustrations from Photographs by the Author'', Year:1901, {{ISBN|9781151940469}}, on 6 November 2008, University of Michigan)</ref>]]
