APA引文

Levin, O. (2016). Discrete mathematics: An open introduction (2nd edition.). [publisher not identified].

Chicago Style (17th ed.) Citation

Levin, Oscar. Discrete Mathematics: An Open Introduction. 2nd edition. [Place of publication not identified]: [publisher not identified], 2016.

MLA引文

Levin, Oscar. Discrete Mathematics: An Open Introduction. 2nd edition. [publisher not identified], 2016.