Citação norma APA
Gratian, a. 1. c., Thompson, A., Gordley, J., & Christensen, K. (1993). The treatise on laws: (Decretum DD. 1-20). Catholic University of America Press.
Citação norma Chicago
Gratian, active 12th century, Augustine Thompson, James Gordley, and Katherine Christensen. The Treatise on Laws: (Decretum DD. 1-20). Washington, District of Columbia: Catholic University of America Press, 1993.
Citação norma MLA
Gratian, active 12th century, et al. The Treatise on Laws: (Decretum DD. 1-20). Catholic University of America Press, 1993.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.