APA

Wiitala S. A., McGraw-Hill (1968-1995), . (1987). Discrete mathematics. New York [etc.]: McGraw Hill Book Company.

Chicago

Wiitala Stephen A, McGraw-Hill (1968-1995), . 1987. Discrete mathematics. New York [etc.]: McGraw Hill Book Company.

Harvard

Wiitala S. A., McGraw-Hill (1968-1995), . (1987). Discrete mathematics. New York [etc.]: McGraw Hill Book Company.

MLA

Wiitala Stephen A, McGraw-Hill (1968-1995), . Discrete mathematics. New York [etc.]: McGraw Hill Book Company. 1987.