APA

Bartell G. D., . (1971). Group sex: a scientist's eyewitness report on the American way of swinging. New York: P. H. Wyden.

Chicago

Bartell Gilbert D, . 1971. Group sex: a scientist's eyewitness report on the American way of swinging. New York: P. H. Wyden.

Harvard

Bartell G. D., . (1971). Group sex: a scientist's eyewitness report on the American way of swinging. New York: P. H. Wyden.

MLA

Bartell Gilbert D, . Group sex: a scientist's eyewitness report on the American way of swinging. New York: P. H. Wyden. 1971.