Williams, R. D., & Hanks, s. H. (1976). Hardwood Nurseryman's guide. U.S.Department of agriculture.
Lua i Stíl Chicago (17ú heag.)Williams, Robert D., agus sidney H. Hanks. Hardwood Nurseryman's Guide. Washigton: U.S.Department of agriculture, 1976.
Lua MLA (9ú heag.)Williams, Robert D., agus sidney H. Hanks. Hardwood Nurseryman's Guide. U.S.Department of agriculture, 1976.
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