Washington (State). Department of Ecology. Toxics Investigations Section. (1995). Department of Ecology 1993-94 investigation of PCBs in the Spokane River. Washington State Dept. of Ecology, Toxics Investigations Section, Environmental Investigations and Laboratory Services Program.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Washington (State). Department of Ecology. Toxics Investigations Section. Department of Ecology 1993-94 Investigation of PCBs in the Spokane River. Olympia, Wash.: Washington State Dept. of Ecology, Toxics Investigations Section, Environmental Investigations and Laboratory Services Program, 1995.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Washington (State). Department of Ecology. Toxics Investigations Section. Department of Ecology 1993-94 Investigation of PCBs in the Spokane River. Washington State Dept. of Ecology, Toxics Investigations Section, Environmental Investigations and Laboratory Services Program, 1995.