International Association on Water Pollution Research and Control. (1991). Yearbook 1990-91 and directory of members IAWPRC: 25th annyversary issue. IAWPRC.
Παραπομπή σε μορφή Chicago (17η εκδ.)International Association on Water Pollution Research and Control. Yearbook 1990-91 and Directory of Members IAWPRC: 25th Annyversary Issue. London: IAWPRC, 1991.
Παραπομπή σε μορφή MLA (9th εκδ.)International Association on Water Pollution Research and Control. Yearbook 1990-91 and Directory of Members IAWPRC: 25th Annyversary Issue. IAWPRC, 1991.
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