• Medicine that Makes You Sick by Robert F. Conkling, MD                   
• NFP and the Couple's Relationship by Dr. Mary Shivanandan                  
• NFP: Myths and Reality  Order pamphlets from by the USCCB Program for NFP
• FAQ on NFP Myths by the USCCB
• Is NFP Good for Your Marriage? by Secretariat of Laity, Marriage, Family Life and Youth, USCCB
• Myths and More Myths by Theresa Notare
• NFP Charting Helps Detect Health Problems by Juliette Glasow
• Choosing an NFP Method - OMFRL NFP Flyer