Fertility
research from the Oxford Journals – Oxford University
Press
The effectiveness of a fertility awareness
based method to
avoid pregnancy in relation to a couple’s
sexual behavior
during the fertile time: a prospective
longitudinal
study
http://www.oxfordjournals.org/eshre/press-release/freepdf/dem003.pdf
Last Updated on March 12, 2007 by Couple to Couple League of Northwest Arkansas