The Billings Method: Controlling Fertility Without Drugs or Devices
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Billings, E. L., & Westmore, A. (1980). *The Billings Method: Controlling Fertility Without Drugs or Devices*.
Billings EL, Westmore A. The Billings Method: Controlling Fertility Without Drugs or Devices. 1980.
Billings, EvelynL. L., and A. Westmore. *The Billings Method: Controlling Fertility Without Drugs or Devices*. 1980.