APA (7th ed.) Citation

Riddle, J. M. (1991). Oral contraceptives and early-term abortifacients during classical antiquity and the middle ages.

Chicago Style (17th ed.) Citation

Riddle, John M. Oral Contraceptives and Early-term Abortifacients During Classical Antiquity and the Middle Ages. 1991.

MLA (9th ed.) Citation

Riddle, John M. Oral Contraceptives and Early-term Abortifacients During Classical Antiquity and the Middle Ages. 1991.

Warning: These citations may not always be 100% accurate.