Dyfyniad APA

Gray, J. A. (1971). The psychology of fear and stress. McGraw-Hill.

Dyfyniad Arddull Chicago

Gray, Jeffrey Alan. The Psychology of Fear and Stress. New York: McGraw-Hill, 1971.

Dyfyniad MLA

Gray, Jeffrey Alan. The Psychology of Fear and Stress. McGraw-Hill, 1971.

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