Cita APA (7a ed.)

Armstrong, R. J., Short, W. J., & Hellmann, J. A. W. (1999). Francis of Assisi: Early documents. New City Press.

Cita Chicago Style (17a ed.)

Armstrong, Regis J., William J. Short, y J. A. Wayne Hellmann. Francis of Assisi: Early Documents. New York [etc.]: New City Press, 1999.

Cita MLA (9a ed.)

Armstrong, Regis J., et al. Francis of Assisi: Early Documents. New City Press, 1999.