Ganss, G. E. (1977). Jesuit religious life today: The principal features of its spirit, in excerpts from papal documents, St. Ignatius' Constitutions, the 31st and 32nd General Congregations, and letters of Father General Pedro Arrupe. Institute of Jesuit Sources.

Ganss, George E. Jesuit Religious Life Today: The Principal Features of Its Spirit, in Excerpts from Papal Documents, St. Ignatius' Constitutions, the 31st and 32nd General Congregations, and Letters of Father General Pedro Arrupe. St. Louis: Institute of Jesuit Sources, 1977.

Ganss, George E. Jesuit Religious Life Today: The Principal Features of Its Spirit, in Excerpts from Papal Documents, St. Ignatius' Constitutions, the 31st and 32nd General Congregations, and Letters of Father General Pedro Arrupe. Institute of Jesuit Sources, 1977.