Style de citation APA (7e éd.)

Twain, M. (2001). What is man? and other essays of Mark Twain. Infomotions, Inc. ; Project Gutenburg.

Style de citation Chicago (17e éd.)

Twain, Mark. What Is Man? and Other Essays of Mark Twain. [South Bend, IN] : [Salt Lake City, Utah]: Infomotions, Inc. ; Project Gutenburg, 2001.

Style de citation MLA (9e éd.)

Twain, Mark. What Is Man? and Other Essays of Mark Twain. Infomotions, Inc. ; Project Gutenburg, 2001.