Willoughby, D. A., Woodson, R. D., & Sutherland, R. (2002). Plastic piping handbook. McGraw-Hill.
Cita Chicago (17th ed.)Willoughby, David A., R. Dodge Woodson, i Rick Sutherland. Plastic Piping Handbook. New York: McGraw-Hill, 2002.
Cita MLA (9th ed.)Willoughby, David A., et al. Plastic Piping Handbook. McGraw-Hill, 2002.
Atenció: Aquestes cites poden no estar 100% correctes.