Dyfyniad APA

Walker, J. C. (1969). Plant pathology (3rd ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Walker, John Charles. Plant Pathology. 3rd ed. Bombay: McGraw-Hill, 1969.

Dyfyniad MLA

Walker, John Charles. Plant Pathology. 3rd ed. McGraw-Hill, 1969.

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