Bondil, P., P. Costa, J. P. Daures, J. F. Louis, and H. Navratil. «Clinical Study of the Longitudinal Deformation of the Flaccid Penis and of Its Variations with Aging». European Urology 21, no. 4 (1992): 284–286.

Costa, Rui Miguel, Geoffrey F. Miller, and Stuart Brody. «Women Who Prefer Longer Penises Are More Likely to Have Vaginal Orgasms (but Not Clitoral Orgasms): Implications for an Evolutionary Theory of Vaginal Orgasm». The Journal of Sexual Medicine 9, no. 12 (2012): 3079–3088.

Grov, Christian, Jeffrey T Parsons, and David S Bimbi. «The Association between Penis Size and Sexual Health among Men Who Have Sex with Men». Archives of Sexual Behavior 39, no. 3 (2010): 788–797.

Jamison, Paul L., and Paul H. Gebhard. «Penis Size Increase between Flaccid and Erect States: An Analysis of the Kinsey Data». 177–183: Routledge, 1988.

Lever, Janet, David A. Frederick, and Letitia Anne Peplau. «Does Size Matter? Men’s and Women’s Views on Penis Size across the Lifespan». Psychology of Men & Masculinity 7, no. 3 (2006): 129–143.

Mautz, Brian S., Bob B. M. Wong, Richard A. Peters, and Michael D. Jennions. «Penis Size Interacts with Body Shape and Height to Influence Male Attractiveness». Proceedings of the National Academy of Sciences 110, no. 17 (2013): 6925–6930.

Pierce, Aaron Paul. «The Coital Alignment Technique (Cat): An Overview of Studies». Journal of Sex & Marital Therapy 26, no. 3 (2000): 257–268.

Schonfeld, W.A. «Normal Growth and Variation in the Male Genitalia from Birth to Maturity» edited by G. W. Beebe, 759. Journal of Urology, 1942.

Wessells, H., T. F. Lue, and J. W. McAninch. «Penile Length in the Flaccid and Erect States: Guidelines for Penile Augmentation». Journal of Urology 156, no. 3 (1996): 995–997.

Wikipedia. «Coital Alignment Technique».

http://en.wikipedia.org/wiki/Coital_alignment_technique.