1. Abnormal Genital Bleeding and Secondary Amenorrhea
JoEllen M. Murata, RN, PHD 
Journal of Obstetric, Gynecologic & Neonatal Nursing 
Volume 19, Issue 1, Pages (January 1990)
DOI: /j tb02523.x
Copyright © 1990 AWHONN, the Association of Women's Health, Obstetric and Neonatal Nurses Terms and Conditions

2. Figure 1 Menstrual cycle changes.
Journal of Obstetric, Gynecologic & Neonatal Nursing  , 26-36DOI: ( /j tb02523.x)
Copyright © 1990 AWHONN, the Association of Women's Health, Obstetric and Neonatal Nurses Terms and Conditions