APA (7th ed.) Citation

Goetz, P. W. (1989). The new Encyclopaedia Britannica. Vol. 20: Macropaedia. Knowledge in depth. Geomorphic - Immunity (15th ed.). Encyclopaedia Britannica.

Chicago Style (17th ed.) Citation

Goetz, P. W. The New Encyclopaedia Britannica. Vol. 20: Macropaedia. Knowledge in Depth. Geomorphic - Immunity. 15th ed. Chicago: Encyclopaedia Britannica, 1989.

MLA (9th ed.) Citation

Goetz, P. W. The New Encyclopaedia Britannica. Vol. 20: Macropaedia. Knowledge in Depth. Geomorphic - Immunity. 15th ed. Encyclopaedia Britannica, 1989.

Warning: These citations may not always be 100% accurate.