Autor: O.p., 56 de titluri

O. P. Ghai,O.p. Ghai

David Thomas O.p. Orique

Gerald P. O’driscoll,Jr.,Mario J. Rizzo

Mark P. O. Morford

Damian P. O'doherty

Kieron P. O′connor

Ravi P. Agarwal,Simona Hodis,Donal O'regan

Augustine Thompson O. P.