توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Colloquium on Trees in Algebra and Programming Copenhagen, Denmark, & Arnold, A. (1990). CAAP '90: 15th Colloquium on Trees in Algebra and Programming, Copenhagen, Denmark, May 1990, proceedings. Springer-Verlag.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Colloquium on Trees in Algebra and Programming Copenhagen, Denmark, و A. Arnold. CAAP '90: 15th Colloquium on Trees in Algebra and Programming, Copenhagen, Denmark, May 1990, Proceedings. Berlin ; New York: Springer-Verlag, 1990.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Colloquium on Trees in Algebra and Programming Copenhagen, Denmark, و A. Arnold. CAAP '90: 15th Colloquium on Trees in Algebra and Programming, Copenhagen, Denmark, May 1990, Proceedings. Springer-Verlag, 1990.