Dyfyniad APA
Worrell, W. A., Vesilind, P. A., & Gupta, T. (2012). Solid Waste Engineering (2nd ed.). Cengage.
Dyfyniad Arddull Chicago
Worrell, William A., P. Aarne Vesilind, and Tarun Gupta. Solid Waste Engineering. 2nd ed. Noida: Cengage, 2012.
Dyfyniad MLA
Worrell, William A., et al. Solid Waste Engineering. 2nd ed. Cengage, 2012.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.