Cita APA (7a ed.)

Welsh, J., & Elder, J. (1979). Introduction to Pascal. Prentice-Hall International.

Cita Chicago Style (17a ed.)

Welsh, Jim, y John Elder. Introduction to Pascal. Englewood Cliffs, New Jersey [etc.]: Prentice-Hall International, 1979.

Cita MLA (9a ed.)

Welsh, Jim, y John Elder. Introduction to Pascal. Prentice-Hall International, 1979.