Larsen. (2013). Flexible Query Answering Systems (1.). Springer Berlin Heidelberg.
Cita Chicago (17th ed.)Larsen. Flexible Query Answering Systems. 1. Springer Berlin Heidelberg, 2013.
Cita MLA (8th ed.)Larsen. Flexible Query Answering Systems. 1. Springer Berlin Heidelberg, 2013.
Atenció: Aquestes cites poden no estar 100% correctes.