参考
Kippley, John; Sheila Kippley (1996). The Art of Natural Family Planning (4th ed.). Cincinnati, OH: The Couple to Couple League. pp. 83–84. ISBN 0-926412-13-2.
Weschler, Toni (2002). Taking Charge of Your Fertility (Revised ed.). New York: HarperCollins. pp. 65–68, 228. ISBN 0-06-093764-5.
Michael H. Ross; Wojciech Pawlina (2006). Histology: A Text and Atlas (5th ed.). Hagerstown, MD: Lippincott Williams & Wilkins. p. 788. ISBN 978-0-7817-7221-1.
"Mittelschmerz". PubMed Health. April 12, 2009. Archived from the original on 2011-02-19.