APA (7th ed.) Citation

O'Leary, M. (1999). Portal wars. Online (0146-5422), 23(1), 77.

Chicago Style (17th ed.) Citation

O'Leary, Mick. "Portal Wars." Online (0146-5422) 23, no. 1 (1999): 77.

MLA (9th ed.) Citation

O'Leary, Mick. "Portal Wars." Online (0146-5422), vol. 23, no. 1, 1999, p. 77.