An American missionary : a record of the work of Rev. William H. Judge, S.J. / by Charles J. Judge ; introduction by His Eminence, Cardinal Gibbons.

http://www.archive.org/details/anamericanmissio00judguoft

The missionary nature of the church; a survey of the Biblical theology of mission.

http://www.archive.org/details/missionarynature013246mbp