Instruction and ordinance concerning the training of ours in the sacred liturgy, c2003 t.p. (V. Rev. John Baptist Janssens, S.J.
New Catholic encyclopedia, 2nd ed. v. 7, p. 792 (under Jesuits: John Baptist Janssens, a Belgian, was superior general of the Jesuits from 1946 to 1964)
OCLC, Aug. 8, 2006 (hdg.: Janssens, John Baptist, 1889-1964, Janssens, John Baptist; usage: John Baptist Janssens)