Amenorrhea. Family Doctor.org website. Available at:
. Updated August 2010. Accessed August 13, 2012.
Current evaluation of amenorrhea. American Society for Reproductive Medicine website. Available at:
. Accessed August 13, 2012.
Secondary amenorrhea. EBSCO DynaMed website. Available at:
. Updated February 3, 2012. Accessed August 13, 2012.
The American Congress of Obstetricians and Gynecologists
The Society of Obstetricians and Gynaecologists of Canada