Keck, L. E. (1988). Paul and his letters (2nd.ed.). Fortress.
Cita Chicago (17th ed.)Keck, Leander E. Paul and His Letters. 2nd.ed. Philadelphia: Fortress, 1988.
Cita MLA (9th ed.)Keck, Leander E. Paul and His Letters. 2nd.ed. Fortress, 1988.
Atenció: Aquestes cites poden no estar 100% correctes.