Tham khảo Tư_thế_úp_thìa

  1. Cox, Tracey. The Hot Sex Handbook (Random House, Inc., 2005), p. 64.
  2. Nilamadhab Kar, Gopal Chandra Kar (2005). Comprehensive Textbook of Sexual Medicine. Jaypee Brothers Publishers. tr. 110–111. ISBN 8180614050. Truy cập ngày 10 tháng 2 năm 2014.Quản lý CS1: sử dụng tham số tác giả (liên kết)
  3. Tim F. LaHaye, Beverly LaHaye, Mike Yorkey. The Act of Marriage After 40: Making Love for Life (Zondervan, 2000), pp. 92-93.
  4. Castleman, Michael. Great Sex: A Man's Guide to the Secret Principles of Total-Body Sex (Rodale, 2004), p. 143.
  5. 1 2 Locker, Sari. The Complete Idiot's Guide to Amazing Sex (Penguin, 2005), pp. 194-195.
  6. 1 2 Sallie Foley, Sally A. Kope, Dennis P. Sugrue. Sex Matters for Women: A Complete Guide to Taking Care of Your Sexual Self (Guilford Press, 2001), pp. 238-239.
  7. 1 2 Rosenau, Douglas E. A Celebration of Sex (Thomas Nelson Inc, 2002), p. 147.
  8. Stefan Bechtel, Larry Stains, Laurence Roy Stains. Sex: A Man's Guide (Rodale, 1996), p. 100.
  9. Keesling, Barbara. Sexual Pleasure: Reaching New Heights of Sexual Arousal and Intimacy (Hunter House, 2005), p. 101.
  10. 1 2 Kalish, Nancy. The Nice Girl's Guide to Sensational Sex (iUniverse, 2003), p. 182.
  11. Taormino, Tristan. Down and Dirty Sex Secrets: The New and Naughty Guide to Being Great in Bed (HarperCollins, 2003), p. 143.
  12. 1 2 Julia Heiman, Joseph Lopiccolo, David Palladini. Becoming Orgasmic: A Sexual and Personal Growth Program for Women (Simon and Schuster, 1987), p. 203.
  13. Salinger, Eve. The Complete Idiot's Guide to Pleasing Your Man (Penguin, 2005).
  14. Younger, John Grimes. Sex in the Ancient World from A to Z (Psychology Press, 2005), p. 124.

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