توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Wangdahl, A. (1977). Types of face-to-face contact in combination with correspondence education: A survey of the literature. Dept. of Education, University of Lund.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Wangdahl, Agneta. Types of Face-to-face Contact in Combination with Correspondence Education: A Survey of the Literature. Lund: Dept. of Education, University of Lund, 1977.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Wangdahl, Agneta. Types of Face-to-face Contact in Combination with Correspondence Education: A Survey of the Literature. Dept. of Education, University of Lund, 1977.