APA Style

Britannica, E. (1978). Encyclopaedia Britannica I : Macropaedia Aalto Arithmetic (15th). Chicago: The University of Chicago Press.

MLA Style

Britannica, Encyclopaedia. "Encyclopaedia Britannica I : Macropaedia Aalto Arithmetic". 15th Chicago: The University of Chicago Press, 1978. Hardcover.