Tohutoro APA (7th ed.)

Hall, T. E., Jones, P. R., & Preston, G. B. (1980). Semigroups. Academic Press.

Tohutoru Kātū Chicago (17th ed.)

Hall, Thomas Eric, P. R. Jones, me G. B. Preston. Semigroups. Nueva York: Academic Press, 1980.

Tohutoro MLA (9th ed.)

Hall, Thomas Eric, et al. Semigroups. Academic Press, 1980.