Allen, E. A. (2001). The prehistoric world or, vanished races / by E. A. Allen: Or, vanished races. Project Gutenberg Literary Archive Foundation.
Chicago Style (17th ed.) CitationAllen, Emory Adams. The Prehistoric World or, Vanished Races / by E. A. Allen: Or, Vanished Races. Salt Lake City: Project Gutenberg Literary Archive Foundation, 2001.
MLA (9th ed.) CitationAllen, Emory Adams. The Prehistoric World or, Vanished Races / by E. A. Allen: Or, Vanished Races. Project Gutenberg Literary Archive Foundation, 2001.
Warning: These citations may not always be 100% accurate.