APA (7th ed.) Citation

Madsen, O. L., Nygaard, K., & Moller-Pedersen, B. (1993). Object-oriented programming in the BETA programming language.

Chicago Style (17th ed.) Citation

Madsen, Ole Lehrmann, Kristen Nygaard, and Birger Moller-Pedersen. Object-oriented Programming in the BETA Programming Language. Wokingham, England : ddison-Wesley, 1993.

MLA (9th ed.) Citation

Madsen, Ole Lehrmann, et al. Object-oriented Programming in the BETA Programming Language. 1993.