Dyfyniad APA

Drucker, P. F. (1980). Managing in turbulent times. London: Heinemann.

Dyfyniad Arddull Chicago

Drucker, Peter F. Managing in Turbulent Times. London: Heinemann, 1980.

Dyfyniad MLA

Drucker, Peter F. Managing in Turbulent Times. London: Heinemann, 1980.

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