Παραπομπή APA

Hughes, J. K. (1979). PL-I structured programming. John Wiley.

Παραπομπή Chicago Style

Hughes, Joan Kirkby. PL-I Structured Programming. New York: John Wiley, 1979.

Παραπομπή MLA

Hughes, Joan Kirkby. PL-I Structured Programming. John Wiley, 1979.