Dyfyniad APA

Director, S. W. (1972). Introduction to systems theory. McGraw-Hill.

Dyfyniad Arddull Chicago

Director, Stephen W. Introduction to Systems Theory. Tokyo: McGraw-Hill, 1972.

Dyfyniad MLA

Director, Stephen W. Introduction to Systems Theory. McGraw-Hill, 1972.

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