Dyfyniad APA

Willoughby, D. A., Woodson, R. D., & Sutherland, R. (2002). Plastic piping handbook. McGraw-Hill.

Dyfyniad Arddull Chicago

Willoughby, David A., R. Dodge Woodson, and Rick Sutherland. Plastic Piping Handbook. New York: McGraw-Hill, 2002.

Dyfyniad MLA

Willoughby, David A., et al. Plastic Piping Handbook. McGraw-Hill, 2002.

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