Cita APA (7a ed.)

Tietze, C. (1962). Intra-uterine contraceptive rings: History and statistical appraisal. National Committee on Maternal Health.

Cita Chicago Style (17a ed.)

Tietze, Christopher. Intra-uterine Contraceptive Rings: History and Statistical Appraisal. New York: National Committee on Maternal Health, 1962.

Cita MLA (9a ed.)

Tietze, Christopher. Intra-uterine Contraceptive Rings: History and Statistical Appraisal. National Committee on Maternal Health, 1962.