Annual Planning and Management Symposium Philadelphia, Pennsylvania, & Solid Waste Association of North America. (1997). Proceedings from 1st annual planning and management symposium: Philadelphia, Pennsylvania, July 9-11, 1997. SWANA.
Παραπομπή σε μορφή Chicago (17η εκδ.)Annual Planning and Management Symposium Philadelphia, Pennsylvania, και Solid Waste Association of North America. Proceedings from 1st Annual Planning and Management Symposium: Philadelphia, Pennsylvania, July 9-11, 1997. Silver Spring, MD: SWANA, 1997.
Παραπομπή σε μορφή MLA (9th εκδ.)Annual Planning and Management Symposium Philadelphia, Pennsylvania, και Solid Waste Association of North America. Proceedings from 1st Annual Planning and Management Symposium: Philadelphia, Pennsylvania, July 9-11, 1997. SWANA, 1997.