APA (7th ed.) Citation

Hèoll, K., Peter, H., & Lèu demann, D. (1982). Water: Examination, assessment, conditioning, chemistry, bacteriology, biology. Walter De Gruyter.

Chicago Style (17th ed.) Citation

Hèoll, Karl, Helmut Peter, and Dietrich Lèu demann. Water: Examination, Assessment, Conditioning, Chemistry, Bacteriology, Biology. Berlin: Walter De Gruyter, 1982.

MLA (9th ed.) Citation

Hèoll, Karl, et al. Water: Examination, Assessment, Conditioning, Chemistry, Bacteriology, Biology. Walter De Gruyter, 1982.