Water Environment Federation Task Force on Safety & Health & Water Environment Federation Technical Practice Committee. (1992). Supervisor's guide to safety and health programs. Water Environment Federation.
Παραπομπή σε μορφή Chicago (17η εκδ.)Water Environment Federation Task Force on Safety & Health και Water Environment Federation Technical Practice Committee. Supervisor's Guide to Safety and Health Programs. Alexandria, VA: Water Environment Federation, 1992.
Παραπομπή σε μορφή MLA (9th εκδ.)Water Environment Federation Task Force on Safety & Health και Water Environment Federation Technical Practice Committee. Supervisor's Guide to Safety and Health Programs. Water Environment Federation, 1992.
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