Hèoll, K., Peter, H., & Lèu demann, D. (1982). Water: Examination, assessment, conditioning, chemistry, bacteriology, biology. Walter De Gruyter.
Čikaški stil citiranja (17. izdanje)Hèoll, Karl, Helmut Peter, i Dietrich Lèu demann. Water: Examination, Assessment, Conditioning, Chemistry, Bacteriology, Biology. Berlin: Walter De Gruyter, 1982.
MLA način citiranja (9. izdanje)Hèoll, Karl, et al. Water: Examination, Assessment, Conditioning, Chemistry, Bacteriology, Biology. Walter De Gruyter, 1982.
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