McElroy, C. H., & Lienhart, D. A. (1993). Rock for erosion control. ASTM.
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Dyfyniad Arddull Chicago
McElroy, Charles H., and David A. Lienhart. Rock for Erosion Control. Philadelphia, PA: ASTM, 1993.
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Dyfyniad MLA
McElroy, Charles H., and David A. Lienhart. Rock for Erosion Control. ASTM, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.