APA (7th ed.) Citation

Thomas, O. (2012). Microsoft System Center 2012. Windows IT Pro, 18(4), 21.

Chicago Style (17th ed.) Citation

Thomas, Orin. "Microsoft System Center 2012." Windows IT Pro 18, no. 4 (2012): 21.

MLA (9th ed.) Citation

Thomas, Orin. "Microsoft System Center 2012." Windows IT Pro, vol. 18, no. 4, 2012, p. 21.