APA (7th ed.) Citation

Lewis, P. (2005). What's cool for school? Fortune, 152(3), 112.

Chicago Style (17th ed.) Citation

Lewis, Peter. "What's Cool for School?" Fortune 152, no. 3 (2005): 112.

MLA (9th ed.) Citation

Lewis, Peter. "What's Cool for School?" Fortune, vol. 152, no. 3, 2005, p. 112.