APA (7th ed.) Citation

N. Ya Vilenkin, A. S. Combinatorics. Academic Press.

Chicago Style (17th ed.) Citation

N. Ya Vilenkin, A. Shenitzer. Combinatorics. Academic Press.

MLA (8th ed.) Citation

N. Ya Vilenkin, A. Shenitzer. Combinatorics. Academic Press.

Warning: These citations may not always be 100% accurate.