APA (7th ed.) Citation

Wright, S. R. (1931). The design and construction of a separate sludge digester. [publisher not identified].

Chicago Style (17th ed.) Citation

Wright, Samuel Robert. The Design and Construction of a Separate Sludge Digester. [College Station, Texas]: [publisher not identified], 1931.

MLA (9th ed.) Citation

Wright, Samuel Robert. The Design and Construction of a Separate Sludge Digester. [publisher not identified], 1931.