Manual for missionary candidates :
and for appointed missionaries before entering their fields /
American Board of Commissioners for Foreign Missions.

APA Citation

American Board of Commissioners for Foreign Missions. (1891). Manual for missionary candidates: and for appointed missionaries before entering their fields. Rev. ed. Boston: The Board.

MLA Citation

American Board of Commissioners for Foreign Missions. Manual for Missionary Candidates: And for Appointed Missionaries Before Entering Their Fields. Rev. ed. Boston: The Board, 1891.

Warning: These citations may not always be complete (especially for serials).