SpringerLink (Online service), Doerr, J., & Opdahl, A. L. (2013). Requirements Engineering: Foundation for Software Quality: 19th International Working Conference, REFSQ 2013, Essen, Germany, April 8-11, 2013. Proceedings. Springer Berlin Heidelberg : Imprint: Springer.
Παραπομπή σε μορφή Chicago (17η εκδ.)SpringerLink (Online service), Joerg Doerr, και Andreas L. Opdahl. Requirements Engineering: Foundation for Software Quality: 19th International Working Conference, REFSQ 2013, Essen, Germany, April 8-11, 2013. Proceedings. Berlin, Heidelberg: Springer Berlin Heidelberg : Imprint: Springer, 2013.
Παραπομπή σε μορφή MLA (8th εκδ.)SpringerLink (Online service), et al. Requirements Engineering: Foundation for Software Quality: 19th International Working Conference, REFSQ 2013, Essen, Germany, April 8-11, 2013. Proceedings. Springer Berlin Heidelberg : Imprint: Springer, 2013.
