APA (7th ed.) Citation

Maurer, H., Krottmaier, H., & Dreher, H. (2006). Important aspects of modern digital libraries. ACM.

Chicago Style (17th ed.) Citation

Maurer, H., H. Krottmaier, and Heinz Dreher. Important Aspects of Modern Digital Libraries. ACM, 2006.

MLA (9th ed.) Citation

Maurer, H., et al. Important Aspects of Modern Digital Libraries. ACM, 2006.