The New Britannica/Webster dictionary & reference guide.
APA Citation
Encyclopaedia Britannica, i. (1981). The New Britannica/Webster dictionary & reference guide. Chicago: Encyclopædia Britannica.
MLA Citation
Encyclopaedia Britannica, inc. The New Britannica/Webster Dictionary & Reference Guide. Chicago: Encyclopædia Britannica, 1981.
Warning: These citations may not always be complete (especially for serials).