Sen. Sotto, ovulation, CBCP's Rhythm द्वारा Aspillera, Dahli

Basic practicalities of natural family planning in terms of of international symbols 0I0 द्वारा Ganar, Linda

Basic practicalities of natural family planning in terms of Philippine symbols RDXM द्वारा Ganar, Linda

Calendar method unreliable in family planning, study says

Standard days method bagong paraan ng natural na pagpaplano ng pamilya

Periodic abstinence in the Philippines new findings from a national survey द्वारा Laing, John E.

And they call it "rhythm" the practice of periodic abstinence in Bicol and the Visayas regions द्वारा Logarta-Avila, Josephine

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