Video 1 on Ovulation Methods - (for example:  Billings, learnnfponline.com,   www.creightonmodel.com, Pope Paul VI Institute - Creighton Model & NaProTECHNOLOGY (www.popepaulvi.com))
Video 2 on Sympto Thermal Methods - (for example:  Couple to Couple League, www.ccli.org)
Video 3 on Sympto Hormonal Methods - (for example:  Marquette Method, nfp.marquette.edu)