APA (7th ed.) Citation

Ditlea, S. (1999). Build Your Own Computer. Popular Mechanics, 176(5), 90.

Chicago Style (17th ed.) Citation

Ditlea, Steve. "Build Your Own Computer." Popular Mechanics 176, no. 5 (1999): 90.

MLA (9th ed.) Citation

Ditlea, Steve. "Build Your Own Computer." Popular Mechanics, vol. 176, no. 5, 1999, p. 90.