Παραπομπή APA

Higgins, P. M. (1992). Techniques of semigroup theory. Oxford University Press.

Παραπομπή Chicago Style

Higgins, Peter M. Techniques of Semigroup Theory. Oxford [England] ; New York: Oxford University Press, 1992.

Παραπομπή MLA

Higgins, Peter M. Techniques of Semigroup Theory. Oxford University Press, 1992.