APA (7th ed.) Citation

STACKPOLE, T. (2016). Solving for X. Smithsonian, 47(5), 12.

Chicago Style (17th ed.) Citation

STACKPOLE, THOMAS. "Solving for X." Smithsonian 47, no. 5 (2016): 12.

MLA (9th ed.) Citation

STACKPOLE, THOMAS. "Solving for X." Smithsonian, vol. 47, no. 5, 2016, p. 12.