Wheeler, B. E. J. (1969). Introduction to plant diseases. John wiley.
Dyfyniad Arddull ChicagoWheeler, B. E. J. Introduction to Plant Diseases. London: John wiley, 1969.
Dyfyniad MLAWheeler, B. E. J. Introduction to Plant Diseases. John wiley, 1969.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.