Παραπομπή APA

Clifford, A. H., & Preston, G. B. (1961). Algebraic theory of semigroups V 1. American Mathematical Society.

Παραπομπή Chicago Style

Clifford, A. H., και G. B. Preston. Algebraic Theory of Semigroups V 1. Rhode Island: American Mathematical Society, 1961.

Παραπομπή MLA

Clifford, A. H., και G. B. Preston. Algebraic Theory of Semigroups V 1. American Mathematical Society, 1961.