APA (7th ed.) Citation
(2015). Think of a number and double it. Economist, 414(8921), 63-65.
Chicago Style (17th ed.) Citation
"Think of a Number and Double It." Economist 414, no. 8921 (2015): 63-65.
MLA (9th ed.) Citation
"Think of a Number and Double It." Economist, vol. 414, no. 8921, 2015, pp. 63-65.
Warning: These citations may not always be 100% accurate.