Gartrell, J. E., Crowder, J., & Callister, J. C. (1992). Earth: The water planet (Rev. ed.). National Science Teachers Association.
Lua i Stíl Chicago (17ú heag.)Gartrell, Jack E., Jane Crowder, agus Jeffrey C. Callister. Earth: The Water Planet. Rev. ed. Arlington, Va.: National Science Teachers Association, 1992.
Lua MLA (8ú heag.)Gartrell, Jack E., et al. Earth: The Water Planet. Rev. ed. National Science Teachers Association, 1992.
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