Dyfyniad APA

Trease, G. E., & By ,Evans , . W. C. (1983). Pharmacognosy (12th ed.). Bailliere Tindall.

Dyfyniad Arddull Chicago

Trease, George Edward, and William Charls By ,Evans. Pharmacognosy. 12th ed. London: Bailliere Tindall, 1983.

Dyfyniad MLA

Trease, George Edward, and William Charls By ,Evans. Pharmacognosy. 12th ed. Bailliere Tindall, 1983.

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