Dyfyniad APA

Modell, M. E. (1988). A professional's guide to systems analysis. McGraw-Hill.

Dyfyniad Arddull Chicago

Modell, Martin E. A Professional's Guide to Systems Analysis. New York: McGraw-Hill, 1988.

Dyfyniad MLA

Modell, Martin E. A Professional's Guide to Systems Analysis. McGraw-Hill, 1988.

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