Gaya APA

Kippley, J, &, K, S. (1989). The art of natural family planning, 3rd ed. Foreword by Konald A. Prem. . Cincinnati: Cincinnati Couple to Couple League.

Gaya MLA

Kippley, John, &, Kippley,, Sheila. "The art of natural family planning, 3rd ed. Foreword by Konald A. Prem. ". Cincinnati: Cincinnati Couple to Couple League, 1989. Buku.