APA (7th ed.) Citation

Gatziu, S., Geppert, A., & Dittrich, K. R. (1991). Integrating active concepts into an object-oriented database system.

Chicago Style (17th ed.) Citation

Gatziu, Styliani, Andreas Geppert, and Klaus R. Dittrich. Integrating Active Concepts into an Object-oriented Database System. Zürich, 1991.

MLA (9th ed.) Citation

Gatziu, Styliani, et al. Integrating Active Concepts into an Object-oriented Database System. 1991.