Cita APA

Encyclopaedia Britannica Films, Encyclopaedia Britannica Films, American Geological Institute, & American Geological Institute. (1964). Erosion leveling the land. Chicago, III.: Encyclopaedia Britannica Educational Corp.

Citación estilo Chicago

Encyclopaedia Britannica Films, Encyclopaedia Britannica Films, American Geological Institute, y American Geological Institute. Erosion Leveling the Land. Chicago, III.: Encyclopaedia Britannica Educational Corp, 1964.

Cita MLA

Encyclopaedia Britannica Films, Encyclopaedia Britannica Films, American Geological Institute, y American Geological Institute. Erosion Leveling the Land. Chicago, III.: Encyclopaedia Britannica Educational Corp, 1964.