Waksman, S. A. (1938). Humus: Origin, chemical composition, and importance in nature (2a. ed.). Williams and Wilkins.
Chicago-čujuhus (17. p.)Waksman, Selman A. Humus: Origin, Chemical Composition, and Importance in Nature. 2a. ed. Baltimore: Williams and Wilkins, 1938.
MLA-čujuhus (9. p.)Waksman, Selman A. Humus: Origin, Chemical Composition, and Importance in Nature. 2a. ed. Williams and Wilkins, 1938.
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