توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

International School of Physics "Enrico Fermi.", Società italiana di fisica, & Ehlers, J. (1979). Isolated gravitating systems in general relativity, Varenna on Lake Como, Villa Monastero, 28th June-10th July 1976. North-Holland Pub. Co..

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

International School of Physics "Enrico Fermi.", Società italiana di fisica, و Jürgen Ehlers. Isolated Gravitating Systems in General Relativity, Varenna on Lake Como, Villa Monastero, 28th June-10th July 1976. Amsterdam ; New York: North-Holland Pub. Co., 1979.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

International School of Physics "Enrico Fermi.", et al. Isolated Gravitating Systems in General Relativity, Varenna on Lake Como, Villa Monastero, 28th June-10th July 1976. North-Holland Pub. Co., 1979.