APA

(1975). The NEW Encyclopaedia Britannica in 30 volumes. Chicago: The Encyclopaedia Britannica.

Chicago

1975. The NEW Encyclopaedia Britannica in 30 volumes. Chicago: The Encyclopaedia Britannica.

Harvard

(1975). The NEW Encyclopaedia Britannica in 30 volumes. Chicago: The Encyclopaedia Britannica.

MLA

The NEW Encyclopaedia Britannica in 30 volumes. Chicago: The Encyclopaedia Britannica. 1975.