Gaya APA

, ., Worrell, W, A. (2011). Solid waste engineering second edition . Cengage Learning, Inc, 2011: Cengage Learning, Inc, 2011.

Gaya MLA

, ., Worrell, William, A.. "Solid waste engineering second edition". Cengage Learning, Inc, 2011: Cengage Learning, Inc, 2011, 2011. .