Marshall, R., & Rosskopf, A. (2001). AGS Earth Science. American Guidance Service inc.
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Dyfyniad Arddull Chicago
Marshall, Robert, and Allen Rosskopf. AGS Earth Science. Minnesota: American Guidance Service inc, 2001.
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Dyfyniad MLA
Marshall, Robert, and Allen Rosskopf. AGS Earth Science. American Guidance Service inc, 2001.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.