Gaya APA

Lipschutz, S., Lipson, S, L, M, L. (1992). 2000 Solved Problems in Discrete Mathematics . New York: #N/A.

Gaya MLA

Lipschutz, Seymour., Lipson, Seymour, Lipschutz, Marc, Lars. "2000 Solved Problems in Discrete Mathematics". New York: #N/A, 1992. .