APA (7th ed.) Citation

Chappell, C. L. (2005). A biological explanation for human sexual orientation. PFLAG Houston Voices.

Chicago Style (17th ed.) Citation

Chappell, Cynthia L. A Biological Explanation for Human Sexual Orientation. Houston, TX: PFLAG Houston Voices, 2005.

MLA (9th ed.) Citation

Chappell, Cynthia L. A Biological Explanation for Human Sexual Orientation. PFLAG Houston Voices, 2005.

Warning: These citations may not always be 100% accurate.