Natural Family Planning

Billings Ovulation Method of Natural Family Planning: http://www.billings-centre.ab.ca/

Billingsova ovulačná metóda (Slovakia): http://www.billings.sk/

Centre Billings (France): http://billings.free.fr/

Centro Studi e Ricerche per la Regolazione Naturale della Fertilitŕ Umana: http://ntweb.rm.unicatt.it/uni_roma/seed/aggiorna.leggi_pagina?vedi_lato=1&p_sessione=99999999&p_oggetto=1253

CLER - Amour et Famille: http://www.cler.net/  

Coalition for Positive Sexuality: http://www.positive.org/Home/index.html 

Couple - Amour - Fécondité (CAF - Belgique): http://www.caf-pfn.be.tf/ 

Couple to Couple League: http://www.ccli.org/

Instituto Valenciano de Fertilidad, Sexualidad y Relaciones Familiares: http://www.agrupacionclinica.com/ivaf/

National Association of the Ovulation Method of Ireland: http://www.naomi.ie/

World Organization Ovulation Method Billings: http://www.woomb.org/  

Lists of links:

Centre Billings (France) - Sites amis: http://billings.free.fr/

Links of Interest -CCL -: http://www.ccli.org/international/links.shtml  

List of Billings centres and contacts: http://www.billings-centre.ab.ca/bc_800.htm