APA (7th ed.) Citation

Nichols, R. L. (1948). Examination and correlation of tests for determining the suitability of trickling filter material. [publisher not identified].

Chicago Style (17th ed.) Citation

Nichols, Robert Leighton. Examination and Correlation of Tests for Determining the Suitability of Trickling Filter Material. [College Station, Tex.]: [publisher not identified], 1948.

MLA (9th ed.) Citation

Nichols, Robert Leighton. Examination and Correlation of Tests for Determining the Suitability of Trickling Filter Material. [publisher not identified], 1948.