APA (7th ed.) Citation

Welsh, J., & Elder, J. (1987). Introduction to Modula-2. Prentice-Hall.

Chicago Style (17th ed.) Citation

Welsh, Jim, and John Elder. Introduction to Modula-2. New York [etc.]: Prentice-Hall, 1987.

MLA (9th ed.) Citation

Welsh, Jim, and John Elder. Introduction to Modula-2. Prentice-Hall, 1987.