APA (7th ed.) Citation

Ignatius, o. L., Palmer, M. E., Padberg, J. W., & McCarthy, J. L. (2006). Letters and instructions. Institite of Jesuit Sources.

Chicago Style (17th ed.) Citation

Ignatius, of Loyola, Martin E. Palmer, John W. Padberg, and John L. McCarthy. Letters and Instructions. Saint Louis, Mo.: Institite of Jesuit Sources, 2006.

MLA (8th ed.) Citation

Ignatius, of Loyola, et al. Letters and Instructions. Institite of Jesuit Sources, 2006.