The Cambridge companion to Francis of Assisi.

MLA

Robson, Michael J.P. The Cambridge Companion to Francis of Assisi. Cambridge: Cambridge university press, 2012.

APA

Robson, M. J.P. (2012). The Cambridge companion to Francis of Assisi. Cambridge: Cambridge university press.

Chicago

Robson, Michael J.P. ed. The Cambridge Companion to Francis of Assisi. Cambridge: Cambridge university press, 2012.