Betz Laboratories Inc. (1991). Betz handbook of industrial water conditioning (9a. ed.). Betz Laboratories Inc.
Tohutoru Kātū Chicago (17th ed.)Betz Laboratories Inc. Betz Handbook of Industrial Water Conditioning. 9a. ed. s.l: Betz Laboratories Inc, 1991.
Tohutoro MLA (9th ed.)Betz Laboratories Inc. Betz Handbook of Industrial Water Conditioning. 9a. ed. Betz Laboratories Inc, 1991.
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