APA Citation

Encyclopaedia Britannica Educational Corporation, & Encyclopaedia Britannica Educational Corporation. (1977). What is ecology? Chicago, III.: Encyclopaedia Britannica Educational Corp.

Chicago Style Citation

Encyclopaedia Britannica Educational Corporation, and Encyclopaedia Britannica Educational Corporation. What Is Ecology? Chicago, III.: Encyclopaedia Britannica Educational Corp, 1977.

MLA Citation

Encyclopaedia Britannica Educational Corporation, and Encyclopaedia Britannica Educational Corporation. What Is Ecology? Chicago, III.: Encyclopaedia Britannica Educational Corp, 1977.

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