APA aipamena

Puts, D. A., Jordan, C. L., & Breedlove, S. M. (2006). O brother, where art thou? The fraternal birth-order effect on male sexual orientation. National Academy of Sciences.

Chicago Style aipamena

Puts, David A., Cynthia L. Jordan, and S. Marc Breedlove. O Brother, Where Art Thou? The Fraternal Birth-order Effect On Male Sexual Orientation. National Academy of Sciences, 2006.

MLA aipamena

Puts, David A., Cynthia L. Jordan, and S. Marc Breedlove. O Brother, Where Art Thou? The Fraternal Birth-order Effect On Male Sexual Orientation. National Academy of Sciences, 2006.