Dyfyniad APA

Peter, D. L. (1969). The Peter Principle: Why Things always go Wrong. Penguin.

Dyfyniad Arddull Chicago

Peter, Dr. Laurence. The Peter Principle: Why Things Always Go Wrong. Penguin, 1969.

Dyfyniad MLA

Peter, Dr. Laurence. The Peter Principle: Why Things Always Go Wrong. Penguin, 1969.

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