Cohn, P. M. (1965). Universal algebra. Harper & Row John Weatherhill, Inc.
Lua i Stíl Chicago (17ú heag.)Cohn, P. M. Universal Algebra. New York, Tokyo: Harper & Row John Weatherhill, Inc, 1965.
Lua MLA (9ú heag.)Cohn, P. M. Universal Algebra. Harper & Row John Weatherhill, Inc, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.