Dyfyniad APA

Drucker, P. F. (1980). Managing in turbulent times. Harper & Row; Butterworth-Heinemann.

Dyfyniad Arddull Chicago

Drucker, Peter F. Managing in Turbulent Times. New York ; Oxford: Harper & Row; Butterworth-Heinemann, 1980.

Dyfyniad MLA

Drucker, Peter F. Managing in Turbulent Times. Harper & Row; Butterworth-Heinemann, 1980.

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