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.
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