SpringerLink (Online service), Damian, D., & Regnell, B. (2012). Requirements engineering: foundation for software quality: 18th International working conference, REFSQ 2012, Essen, Germany, March 19-22, 2012. Proceedings. Springer Berlin Heidelberg.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)SpringerLink (Online service), Daniela Damian, و Björn Regnell. Requirements Engineering: Foundation for Software Quality: 18th International Working Conference, REFSQ 2012, Essen, Germany, March 19-22, 2012. Proceedings. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)SpringerLink (Online service), et al. Requirements Engineering: Foundation for Software Quality: 18th International Working Conference, REFSQ 2012, Essen, Germany, March 19-22, 2012. Proceedings. Springer Berlin Heidelberg, 2012.