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

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

Basic practicalities of natural family planning in terms of Philippine symbols RDXM по 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 по Laing, John E.

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

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