Παραπομπή APA

Hardin, G. (1969). Population evoloution and birth control: College of controversial ideas (2nd. ed.). W H Freeman.

Παραπομπή Chicago Style

Hardin, Garrett. Population Evoloution and Birth Control: College of Controversial Ideas. 2nd. ed. W H Freeman, 1969.

Παραπομπή MLA

Hardin, Garrett. Population Evoloution and Birth Control: College of Controversial Ideas. 2nd. ed. W H Freeman, 1969.