While you and perhaps others will want to so more secular sources, and I will, of course welcome them, here is a statement from the Vatcian stating that "The Church has always taught the intrinsic evil of contraception..."http://www.vatican.va/roman_curia/pontifical_councils/family/documents/rc_pc_family_doc_12021997_vademecum_en.html  Furthermore, by precedent set on numinous other pages on Wikipeida pages, therealpressense, Catholic Answers, and EWTN have all been used and viewed as acceptable as a source of Catholic history.  All of this aside though, this debated fact really doesn't have a place on this page.