International Workshop on Requirements Engineering : Foundations of Software Quality Stockholm, Sweden, Pohl, K., Rossi, M., & Opdahl, A. L. (2000). Proceedings of the Sixth International Workshop on Requirements Engineering: Foundations of Software Quality : REFSQ '00, Stockholm, Sweden, 5-6 June, 2000. Essener Informatik Beiträge.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)International Workshop on Requirements Engineering : Foundations of Software Quality Stockholm, Sweden, Klaus Pohl, Matti Rossi, و Andreas L. Opdahl. Proceedings of the Sixth International Workshop on Requirements Engineering: Foundations of Software Quality : REFSQ '00, Stockholm, Sweden, 5-6 June, 2000. [Essen?]: Essener Informatik Beiträge, 2000.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)International Workshop on Requirements Engineering : Foundations of Software Quality Stockholm, Sweden, et al. Proceedings of the Sixth International Workshop on Requirements Engineering: Foundations of Software Quality : REFSQ '00, Stockholm, Sweden, 5-6 June, 2000. Essener Informatik Beiträge, 2000.