Hill, A. F. (1952). Economic botony: A text book of useful plants and plant products (2nd ed.). McGraw-Hill.
Dyfyniad Arddull ChicagoHill, Albert F. Economic Botony: A Text Book of Useful Plants and Plant Products. 2nd ed. Newyork: McGraw-Hill, 1952.
Dyfyniad MLAHill, Albert F. Economic Botony: A Text Book of Useful Plants and Plant Products. 2nd ed. McGraw-Hill, 1952.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.