APA Style
BILLINGS, Evelyn L, John J. Billings, Evelyn L. Billings. (1997).
Teaching The Billings Ovulation Method .
Melbourne:
Ovulation Method Research and Reference Centre Of Australia.
Chicago Style
BILLINGS, Evelyn L, John J. Billings, Evelyn L. Billings.
Teaching The Billings Ovulation Method.
Melbourne:
Ovulation Method Research and Reference Centre Of Australia,
1997.
.
MLA Style
BILLINGS, Evelyn L, John J. Billings, Evelyn L. Billings.
Teaching The Billings Ovulation Method.
Melbourne:
Ovulation Method Research and Reference Centre Of Australia,
1997.
.
Turabian Style
BILLINGS, Evelyn L, John J. Billings, Evelyn L. Billings.
Teaching The Billings Ovulation Method.
Melbourne:
Ovulation Method Research and Reference Centre Of Australia,
1997.
.