Colorado State University & Van Zyl, D. J. A. (1986). Geotechnical and geohydrological aspects of waste management: Proceedings of the 9th Annual Symposium on Geo-Aspects of waste management, February 1-6, 1987 Colorado State University, Fort Collins, Colorado. Lewis.
Παραπομπή σε μορφή Chicago (17η εκδ.)Colorado State University και Dirk J. A. Van Zyl. Geotechnical and Geohydrological Aspects of Waste Management: Proceedings of the 9th Annual Symposium on Geo-Aspects of Waste Management, February 1-6, 1987 Colorado State University, Fort Collins, Colorado. Michigan: Lewis, 1986.
Παραπομπή σε μορφή MLA (9th εκδ.)Colorado State University και Dirk J. A. Van Zyl. Geotechnical and Geohydrological Aspects of Waste Management: Proceedings of the 9th Annual Symposium on Geo-Aspects of Waste Management, February 1-6, 1987 Colorado State University, Fort Collins, Colorado. Lewis, 1986.