Bulfin, R. L., & Weaver, H. L. (1977). Appropriate technology for natural resources development (ed.). The University of Arizona.
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Dyfyniad Arddull Chicago
Bulfin, Robert L., and Harry L. Weaver. Appropriate Technology for Natural Resources Development. ed. Tucson: The University of Arizona, 1977.
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Dyfyniad MLA
Bulfin, Robert L., and Harry L. Weaver. Appropriate Technology for Natural Resources Development. ed. The University of Arizona, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.