Kass-Annese, Barbara. The fertility awareness handbook : : the natural guide to avoiding or achieving pregnancy / [electronic resource] / Barbara Kass-Annese & Hal Danzer.. — 6th ed.. — Alameda, CA : : Hunter House,, c1992.. — v, 148 p. : : ill. ; 23 cm.
Updated ed. of: The fertility awareness workbook. 5th ed. 1990.
Includes bibliographical references (p. 144-146) and index.