APA-referens (7:e uppl.)
Twain, M. (2001). What is man? and other essays of Mark Twain. Infomotions, Inc. ; Project Gutenburg.
Chicago-referens (17:e uppl.)
Twain, Mark. What Is Man? and Other Essays of Mark Twain. [South Bend, IN] : [Salt Lake City, Utah]: Infomotions, Inc. ; Project Gutenburg, 2001.
MLA-referens (9:e uppl.)
Twain, Mark. What Is Man? and Other Essays of Mark Twain. Infomotions, Inc. ; Project Gutenburg, 2001.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.