ebrary, Inc, & Carlsen, W. S. (2004). Watershed dynamics (Teacher ed.). National Science Teachers Association.
Čikaški stil citiranja (17. izdanje)ebrary, Inc, i William S. Carlsen. Watershed Dynamics. Teacher ed. Arlington, Va.: National Science Teachers Association, 2004.
MLA način citiranja (9. izdanje)ebrary, Inc, i William S. Carlsen. Watershed Dynamics. Teacher ed. National Science Teachers Association, 2004.
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