APA
Steven Roman, . (1989). An introduction to discrete mathematics. San Diego: Harcourt Brace Jovanovich.
Chicago
Steven Roman, . 1989. An introduction to discrete mathematics. San Diego: Harcourt Brace Jovanovich.
Harvard
Steven Roman, . (1989). An introduction to discrete mathematics. San Diego: Harcourt Brace Jovanovich.
MLA
Steven Roman, . An introduction to discrete mathematics. San Diego: Harcourt Brace Jovanovich. 1989.