APA (7th ed.) Citation

Wirth, N., & Gries, D. (1988). Programming in Modula-2 (4th ed.). Springer.

Chicago Style (17th ed.) Citation

Wirth, Niklaus, and David Gries. Programming in Modula-2. 4th ed. Berlin [etc.]: Springer, 1988.

MLA (9th ed.) Citation

Wirth, Niklaus, and David Gries. Programming in Modula-2. 4th ed. Springer, 1988.