APA (7th ed.) Citation

Feeney, W. J. (1954). Certain unsolvable problems in the theory of cancellation semi-groups.

Chicago Style (17th ed.) Citation

Feeney, Walter J. Certain Unsolvable Problems in the Theory of Cancellation Semi-groups. Washington, D.C. : Catholic University of Americ a Press, 1954.

MLA (8th ed.) Citation

Feeney, Walter J. Certain Unsolvable Problems in the Theory of Cancellation Semi-groups. 1954.