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"At what age does a girl get her first period?," from Menstruation and the Menstrual Cycle, National Women's Héalth Information Center (accessed June 11, 2005).

Ibid., "What is a typical menstrual period like?" (accessed June 11, 2005).

"Lower olfactory threshold during the ovulatory phase of the menstrual cycle" by E. Navarrete-Palacios, R. Hudson, G. Reyes-Guerrero and R. Guevara-Guzman in Biol Psychol. (2003) volume 63 page 269-279 PMID 12853171

M. Ball, "A prospective field trial of the Ovulation Method", Européan Journal of Obstetrical and Gynaecological Reproductive Biology, 6/2, 63-6, 1976. (Summarized at Trials of the Billings Ovulation Method accessed November 3, 2005)

"Medical Microbiology" 4th ed.  Online textbook Samule Baron, editor. (1996) Published by University of Texas Medical Branch; Galveston (TX)