Andreasen, T., Christiansen, H., & Larsen, H. L. (1997). Flexible Query Answering Systems. Springer US : Imprint : Springer.
Chicago Style (17th ed.) CitationAndreasen, Troels, Henning Christiansen, and Henrik Legind Larsen. Flexible Query Answering Systems. Boston, MA: Springer US : Imprint : Springer, 1997.
MLA (9th ed.) CitationAndreasen, Troels, et al. Flexible Query Answering Systems. Springer US : Imprint : Springer, 1997.
Warning: These citations may not always be 100% accurate.