APA (7th ed.) Citation

Adler, M. J., & Hutchins, R. M.. (1963). Gateway to the great books. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Adler, Mortimer J., and Robert Maynard Hutchins. Gateway to the Great Books. Chicago: Encyclopedia Britannica, 1963.

MLA (9th ed.) Citation

Adler, Mortimer J., and Robert Maynard Hutchins. Gateway to the Great Books. Encyclopedia Britannica, 1963.