APA (7th ed.) Citation

Ljapin, E. S. (1963). Semigroups (Rev. ed.). American Math. Soc.

Chicago Style (17th ed.) Citation

Ljapin, E. S. Semigroups. Rev. ed. Providence: American Math. Soc, 1963.

MLA (9th ed.) Citation

Ljapin, E. S. Semigroups. Rev. ed. American Math. Soc, 1963.