APA

Wiitala S. A., . (1987). Discrete mathematics. New York [u.a.]: McGraw-Hill.

Chicago

Wiitala Stephen A, . 1987. Discrete mathematics. New York [u.a.]: McGraw-Hill.

Harvard

Wiitala S. A., . (1987). Discrete mathematics. New York [u.a.]: McGraw-Hill.

MLA

Wiitala Stephen A, . Discrete mathematics. New York [u.a.]: McGraw-Hill. 1987.