Arrupe, P., & Aixala, J. (1979). Challenge to religious life today (2d ed.). Institute of Jesuit Sources ; Gujarat Sahitya Prakash.
Chicago-referens (17:e uppl.)Arrupe, Pedro, och Jerome Aixala. Challenge to Religious Life Today. 2d ed. St. Louis : Anand, India: Institute of Jesuit Sources ; Gujarat Sahitya Prakash, 1979.
MLA-referens (8:e uppl.)Arrupe, Pedro, och Jerome Aixala. Challenge to Religious Life Today. 2d ed. Institute of Jesuit Sources ; Gujarat Sahitya Prakash, 1979.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.