Summer school in logic :Leeds, GB, & Löb, M. H. (1968). Proceedings of the Summer school in logic, Leeds, 1967: NATO Advanced study institute, meeting of the Association for symbolic logic. Springer-Verlag.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Summer school in logic :Leeds, GB, و Martin Hugo Löb. Proceedings of the Summer School in Logic, Leeds, 1967: NATO Advanced Study Institute, Meeting of the Association for Symbolic Logic. Berlin ; Heidelberg ; New York: Springer-Verlag, 1968.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Summer school in logic :Leeds, GB, و Martin Hugo Löb. Proceedings of the Summer School in Logic, Leeds, 1967: NATO Advanced Study Institute, Meeting of the Association for Symbolic Logic. Springer-Verlag, 1968.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.