Alba, J. R. (1991). Natural birth control for avoiding or achieving pregnancy: The dry or wet method (2nd ed.). Alba Natural Family Planning Organization.
Chicagoスタイル(17版)引用形式Alba, Jose R. Natural Birth Control for Avoiding or Achieving Pregnancy: The Dry or Wet Method. 2nd ed. Makati, Metro Manila: Alba Natural Family Planning Organization, 1991.
MLA(9版)引用形式Alba, Jose R. Natural Birth Control for Avoiding or Achieving Pregnancy: The Dry or Wet Method. 2nd ed. Alba Natural Family Planning Organization, 1991.
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