1. Bartell, G.D. Group sex among the Mid-Americans. In N.N. Wagner (ed.),Perspectives on human sexuality. New York: Behavioral Publications,1974.
2. ??Group sex: A scientists' eyewitness report on the American way of swinging. New York: Wyden, 1971.
3. Bell, R.R. Swinging?The sexual exchange of marriage partners.Sex Behavior 1971,1 70?79.
4. Block, J.The challenge of response sets: Unconfounding meaning, acquiescence and social desirability in the MMPI. New York: Appleton-Century-Crofts, 1965.
5. Cole, C.L., & Spanier, G.G. Comarital mate-sharing and family stability.Journal of Sex Research 1974,10, 21?31.