APA (7th ed.) Citation

Ma, K. (2004). Systems. Computer Bulletin, 46(5), 31.

Chicago Style (17th ed.) Citation

Ma, Karen. "Systems." Computer Bulletin 46, no. 5 (2004): 31.

MLA (9th ed.) Citation

Ma, Karen. "Systems." Computer Bulletin, vol. 46, no. 5, 2004, p. 31.