Betz Laboratories Inc. (1991). Betz handbook of industrial water conditioning (9a. ed.). Betz Laboratories Inc.
Chicago-čujuhus (17. p.)Betz Laboratories Inc. Betz Handbook of Industrial Water Conditioning. 9a. ed. s.l: Betz Laboratories Inc, 1991.
MLA-čujuhus (9. p.)Betz Laboratories Inc. Betz Handbook of Industrial Water Conditioning. 9a. ed. Betz Laboratories Inc, 1991.
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