APA (7th ed.) Citation

Vilenkin, N. J., Shenitzer, A., & Shenitzer, S. (1971). Combinatorics. Academic Press.

Chicago Style (17th ed.) Citation

Vilenkin, Naum Ja., Abe Shenitzer, and S. Shenitzer. Combinatorics. New York and London: Academic Press, 1971.

MLA (9th ed.) Citation

Vilenkin, Naum Ja., et al. Combinatorics. Academic Press, 1971.