Petrich, M. (1977). Lectures in Semigroups. New York: John Wiley and Sons.
Trích dẫn kiểu ChicagoPetrich, Mario. Lectures in Semigroups. New York: John Wiley and Sons, 1977.
MLA CitationPetrich, Mario. Lectures in Semigroups. New York: John Wiley and Sons, 1977.
Advarsel: Disse citationer er muligvist ikke 100% nøjagtige.