APA (7th ed.) Citation

Spring, H., & Carroll, D. (1951). Which happened first? Power, 95, 119.

Chicago Style (17th ed.) Citation

Spring, H., and D. Carroll. "Which Happened First?" Power 95 (1951): 119.

MLA (9th ed.) Citation

Spring, H., and D. Carroll. "Which Happened First?" Power, vol. 95, 1951, p. 119.