- altcontraceptives.com
 - Provides information partly drawn from the usenet group of the same name, about the reliablity and side-effects of various contraceptive methods, myths, international contact information, and more. - Contraception.co.uk
- Provider of comprehensive information on available contraceptive choices. Helps you choose a birth control method that suits your lifestyle.
- Wikipedia: Marie Stopes
- User-edited biography of Marie Stopes, campaigner for women's rights and pioneer in the field of family planning.
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