APA (7th ed.) Citation

Bowles, O. (1931). Significant features of wire-saw operation in Europe. [publisher not identified].

Chicago Style (17th ed.) Citation

Bowles, Oliver. Significant Features of Wire-saw Operation in Europe. Washington, D.C.: [publisher not identified], 1931.

MLA (9th ed.) Citation

Bowles, Oliver. Significant Features of Wire-saw Operation in Europe. [publisher not identified], 1931.