APA (7th ed.) Citation

Andreasen, T., Christiansen, H., & Larsen, H. L. (1997). Flexible Query Answering Systems. Springer US : Imprint : Springer.

Chicago Style (17th ed.) Citation

Andreasen, Troels, Henning Christiansen, and Henrik Legind Larsen. Flexible Query Answering Systems. Boston, MA: Springer US : Imprint : Springer, 1997.

MLA (9th ed.) Citation

Andreasen, Troels, et al. Flexible Query Answering Systems. Springer US : Imprint : Springer, 1997.