APA (7th ed.) Citation

Emerson, H. (1916). The twelve principles of efficiency. The Engineering magazine.

Chicago Style (17th ed.) Citation

Emerson, Harrington. The Twelve Principles of Efficiency. New York: The Engineering magazine, 1916.

MLA (9th ed.) Citation

Emerson, Harrington. The Twelve Principles of Efficiency. The Engineering magazine, 1916.