Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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