APA (7th ed.) Citation

Jantz, R. (1991). Harvard Graphics scores again. PCWorld, 9(6), 89.

Chicago Style (17th ed.) Citation

Jantz, R. "Harvard Graphics Scores Again." PCWorld 9, no. 6 (1991): 89.

MLA (9th ed.) Citation

Jantz, R. "Harvard Graphics Scores Again." PCWorld, vol. 9, no. 6, 1991, p. 89.