Industrial Waste Conference Purdue University, Purdue University. School of Civil Engineering, & Purdue University. Division of Conference and Continuing Education. (1990). Proceedings of the 44th Industrial Waste Conference, May 9, 10, 11, 1989, Purdue University, West Lafayette, Indiana. Lewis Publishers.
Cita Chicago (17th ed.)Industrial Waste Conference Purdue University, Purdue University. School of Civil Engineering, i Purdue University. Division of Conference and Continuing Education. Proceedings of the 44th Industrial Waste Conference, May 9, 10, 11, 1989, Purdue University, West Lafayette, Indiana. Chelsea, MI: Lewis Publishers, 1990.
Cita MLA (9th ed.)Industrial Waste Conference Purdue University, et al. Proceedings of the 44th Industrial Waste Conference, May 9, 10, 11, 1989, Purdue University, West Lafayette, Indiana. Lewis Publishers, 1990.