Cita APA

Encyclopaedia Britannica Educational Corporation, & Encyclopaedia Britannica Educational Corporation. (1990). The Universe: Beyond the solar system. Chicago, III.: Encyclopaedia Britannica Educational Corp.

Citación estilo Chicago

Encyclopaedia Britannica Educational Corporation, y Encyclopaedia Britannica Educational Corporation. The Universe: Beyond the Solar System. Chicago, III.: Encyclopaedia Britannica Educational Corp, 1990.

Cita MLA

Encyclopaedia Britannica Educational Corporation, y Encyclopaedia Britannica Educational Corporation. The Universe: Beyond the Solar System. Chicago, III.: Encyclopaedia Britannica Educational Corp, 1990.