SOFSEM 2007 Harrachov, Libereck kraj, Czech Republic, & Leeuwen, J. v. (2007). SOFSEM 2007: Theory and practice of computer science : 33rd Conference on Current Trends in Theory and Practice of Computer Science, Harrachov, Czech Republic, January 20-26, 2007 : proceedings. Springer.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)SOFSEM 2007 Harrachov, Libereck kraj, Czech Republic, و J. van Leeuwen. SOFSEM 2007: Theory and Practice of Computer Science : 33rd Conference on Current Trends in Theory and Practice of Computer Science, Harrachov, Czech Republic, January 20-26, 2007 : Proceedings. Berlin ; New York: Springer, 2007.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)SOFSEM 2007 Harrachov, Libereck kraj, Czech Republic, و J. van Leeuwen. SOFSEM 2007: Theory and Practice of Computer Science : 33rd Conference on Current Trends in Theory and Practice of Computer Science, Harrachov, Czech Republic, January 20-26, 2007 : Proceedings. Springer, 2007.