APA (7th ed.) Citation

Petrich, M. (1977). Lectures in semigroups. Akademie-Verl.

Chicago Style (17th ed.) Citation

Petrich, Mario. Lectures in Semigroups. Berlin: Akademie-Verl, 1977.

MLA (9th ed.) Citation

Petrich, Mario. Lectures in Semigroups. Akademie-Verl, 1977.