APA (7th ed.) Citation

Nichols, J. B. (1964). The numerical proportions of the sexes at birth. Kraus.

Chicago Style (17th ed.) Citation

Nichols, John Benjamin. The Numerical Proportions of the Sexes at Birth. New York: Kraus, 1964.

MLA (9th ed.) Citation

Nichols, John Benjamin. The Numerical Proportions of the Sexes at Birth. Kraus, 1964.