توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Marcus, E. (1993). It is a choice?: Answers to 300 of the most frequently asked questions about gays and lesbians / Eric Marcus (1. Auflage.). HarperSanFrancisco.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Marcus, Eric. It Is a Choice?: Answers to 300 of the Most Frequently Asked Questions About Gays and Lesbians / Eric Marcus. 1. Auflage. San Francisco: HarperSanFrancisco, 1993.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Marcus, Eric. It Is a Choice?: Answers to 300 of the Most Frequently Asked Questions About Gays and Lesbians / Eric Marcus. 1. Auflage. HarperSanFrancisco, 1993.