APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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