Cita APA (7th ed.)

Okun, B. (1958). Trends in birth rates in the United States since 1870. Johns Hopkins Press.

Cita Chicago (17th ed.)

Okun, Bernard. Trends in Birth Rates in the United States Since 1870. Baltimore: Johns Hopkins Press, 1958.

Cita MLA (9th ed.)

Okun, Bernard. Trends in Birth Rates in the United States Since 1870. Johns Hopkins Press, 1958.