Peter, t. V., Martin, J., & Constable, G. (1974). Selected letters. Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies.
Citação norma ChicagoPeter, the Venerable, Janet Martin, and Giles Constable. Selected Letters. Toronto: Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies, 1974.
Citação norma MLAPeter, the Venerable, et al. Selected Letters. Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies, 1974.
Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.