APA Style

Britannica, T, N, E. (1929-1973). The new Encyclopaedia Britannica (Fouth Edition). Chicago: The new Encyclopaedia Britannica inc.

MLA Style

Britannica, The, New, Encyclopaedia. "The new Encyclopaedia Britannica". Fouth Edition Chicago: The new Encyclopaedia Britannica inc, 1929-1973. Text.