Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Precaución: Estas citas no son 100% exactas.