Dyfyniad APA

Williams, R. D., & Hanks, s. H. (1976). Hardwood Nurseryman's guide. U.S.Department of agriculture.

Dyfyniad Arddull Chicago

Williams, Robert D., and sidney H. Hanks. Hardwood Nurseryman's Guide. Washigton: U.S.Department of agriculture, 1976.

Dyfyniad MLA

Williams, Robert D., and sidney H. Hanks. Hardwood Nurseryman's Guide. U.S.Department of agriculture, 1976.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.