Gaya APA

Investigating the Earth. (1967). Boston: Houghton Mifflin Company.

Gaya Chicago

Investigating the Earth. cet.1. Boston: Houghton Mifflin Company, 1967. .

Gaya MLA

Investigating the Earth. cet.1. Boston: Houghton Mifflin Company, 1967. .

Gaya Turabian

Investigating the Earth. Boston: Houghton Mifflin Company, 1967. .