American Geological Institute, Earth Science Curriculum Project, & Matthews, W. H. (1978). Investigating the earth (3rd ed.). Houghton Mifflin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रAmerican Geological Institute, Earth Science Curriculum Project, और William H. Matthews. Investigating the Earth. 3rd ed. Boston: Houghton Mifflin, 1978.
एमएलए (9वां संस्करण) प्रशस्ति पत्रAmerican Geological Institute, et al. Investigating the Earth. 3rd ed. Houghton Mifflin, 1978.
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