APA (7th ed.) Citation

Southwell, R. V. (1940). Relaxation methods in engineering science: A treatise on approximate computation. O.U.P..

Chicago Style (17th ed.) Citation

Southwell, R. V. Relaxation Methods in Engineering Science: A Treatise on Approximate Computation. Lond.: O.U.P., 1940.

MLA (8th ed.) Citation

Southwell, R. V. Relaxation Methods in Engineering Science: A Treatise on Approximate Computation. O.U.P., 1940.