Style de citation APA (7e éd.)

Northrop, E. P. (1944). Riddles in mathematics: A book of paradoxes. Van Nostrand.

Style de citation Chicago (17e éd.)

Northrop, Eugene Purdy. Riddles in Mathematics: A Book of Paradoxes. New York: Van Nostrand, 1944.

Style de citation MLA (9e éd.)

Northrop, Eugene Purdy. Riddles in Mathematics: A Book of Paradoxes. Van Nostrand, 1944.