Brennan, John J.
"[Book Review of] The Ovulation Method of Natural Family Planning, Book One - Basic Teaching Skills, by Thomas Hilgers, M.D., K. Diane Daly, R.N., Susan Hilgers, B.A., and Ann Prebil, R.N.,"
The Linacre Quarterly: Vol. 50
, Article 15.
Available at: http://epublications.marquette.edu/lnq/vol50/iss2/15