Conwell, J. F. (. 1. (1997). Impelling spirit: Revisiting a founding experience, 1539, Ignatius de Loyola and his companions : an exploration into the spirit and aims of the Society of Jesus as revealed in the founders' proposed papal letter approving the Society. Chicago, Illinois: Loyola Press.

Conwell, Joseph F. (S.I.) 1919-2014. Impelling Spirit: Revisiting a Founding Experience, 1539, Ignatius De Loyola and His Companions : An Exploration Into the Spirit and Aims of the Society of Jesus As Revealed in the Founders' Proposed Papal Letter Approving the Society. Chicago, Illinois: Loyola Press, 1997.

Conwell, Joseph F. (S.I.) 1919-2014. Impelling Spirit: Revisiting a Founding Experience, 1539, Ignatius De Loyola and His Companions : An Exploration Into the Spirit and Aims of the Society of Jesus As Revealed in the Founders' Proposed Papal Letter Approving the Society. Chicago, Illinois: Loyola Press, 1997.