Dyfyniad APA

Drucker, P. F. (1995). Managing in a time of great change. Butterworth-Heinemann.

Dyfyniad Arddull Chicago

Drucker, Peter Ferdinand. Managing in a Time of Great Change. Oxford: Butterworth-Heinemann, 1995.

Dyfyniad MLA

Drucker, Peter Ferdinand. Managing in a Time of Great Change. Butterworth-Heinemann, 1995.

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