The mission as a frontier institution in the Spanish american colonies, by Herbert E. Bolton.

http://www.archive.org/details/missionasfrontie00boltrich

The social aspects of foreign missions, by William Herbert Perry Faunce.

http://www.archive.org/details/socialaspectsoff013484mbp

The Australian aboriginal and the Christian church

http://www.archive.org/details/australianaborig00pittuoft