American Geological Institute. (1984). Investigating the earth: Teacher's manual (4th ed.). Houghton Mifflin Co..
Čikaški stil citiranja (17. izdanje)American Geological Institute. Investigating the Earth: Teacher's Manual. 4th ed. Boston: Houghton Mifflin Co., 1984.
MLA način citiranja (9. izdanje)American Geological Institute. Investigating the Earth: Teacher's Manual. 4th ed. Houghton Mifflin Co., 1984.
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