Cita APA (7th ed.)

Keep, A. V. (1981). The Premenstrual Syndrome. MTP Press Limited.

Cita Chicago (17th ed.)

Keep, A. Van. The Premenstrual Syndrome. Berlin: MTP Press Limited, 1981.

Cita MLA (9th ed.)

Keep, A. Van. The Premenstrual Syndrome. MTP Press Limited, 1981.