Dyfyniad APA

Trease, G. E., & By Evans , W. C. (1971). Pharmacognosy (10th ed.). Bailliere Tindall.

Dyfyniad Arddull Chicago

Trease, George Edward, and William Charles By Evans. Pharmacognosy. 10th ed. London: Bailliere Tindall, 1971.

Dyfyniad MLA

Trease, George Edward, and William Charles By Evans. Pharmacognosy. 10th ed. Bailliere Tindall, 1971.

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