APA (7th ed.) Citation

O'Reilly, W. E., & Steven-Johan, Z. (1992). The enemy within. Times Books Internat.

Chicago Style (17th ed.) Citation

O'Reilly, William E., and Zarin Steven-Johan. The Enemy Within. Singapore [u.a.]: Times Books Internat, 1992.

MLA (9th ed.) Citation

O'Reilly, William E., and Zarin Steven-Johan. The Enemy Within. Times Books Internat, 1992.