Welsh, J., & McKeag, M. (1980). Structured system programming. Englewood Cliffs, N.J. : Prentice-Hall.
Cita Chicago (17th ed.)Welsh, Jim, i Michael McKeag. Structured System Programming. Englewood Cliffs, N.J. : Prentice-Hall, 1980.
Cita MLA (9th ed.)Welsh, Jim, i Michael McKeag. Structured System Programming. Englewood Cliffs, N.J. : Prentice-Hall, 1980.
Atenció: Aquestes cites poden no estar 100% correctes.