MILLER, Philip; DEVON, Molly. Screw the Roses, Send Me the Thorns: The Romance and Sexual Sorcery of Sadomasochism. Fairfield: Mystic Rose Books, 1995. 277 s. Dostupné online. ISBN978-0964596009. S. 83. (anglicky)
ROSS, Laura. The Secrets to Sensational Foreplay: The Hottest Ways to Touch Your Lover for Incredible Pleasure, Stronger Orgasms, and Longer, Better Sex. Beverly: Quiver, 2010. 160 s. Dostupné online. ISBN978-1592334285. S. 74. (anglicky)
COPELAND, Pala; LINK, Al. 28 Days to Ecstasy for Couples: Tantra Step by Step. Woodbury: Llewellyn Publications, 2007. 204 s. Dostupné online. ISBN978-0738709994. S. 138. (anglicky)
TAORMINO, Tristan. The Anal Sex Position Guide: The Best Positions for Easy, Exciting, Mind-Blowing Pleasure. Beverly: Quiver, 2009. 176 s. Dostupné online. ISBN978-1592333561. S. 145–146. (anglicky)