Billings, E. (1988). The Billings method: Controlling fertility without drug or devices. Ballantine.
Chicago Style (17th ed.) CitationBillings, Evelyn. The Billings Method: Controlling Fertility Without Drug or Devices. Ballantine, 1988.
MLA (9th ed.) CitationBillings, Evelyn. The Billings Method: Controlling Fertility Without Drug or Devices. Ballantine, 1988.
Warning: These citations may not always be 100% accurate.