John Gray (2012). “Men Are from Mars, Women Are from Venus: A Practical Guide for Improving Communication and Getting What You Want in Your Relationships”, p.10, HarperCollins UK
Joshua Harris, Shannon Harris (2010). “Sex Is Not the Problem (Lust Is) - A Study Guide for Women: Sexuality Purity in a Lust-Saturated World”, p.41, Multnomah