Columbia subject headings:
Petrus, Cantor, approximately 1130-1197. De oratione et speciebus illius.
Petrus, Cantor, approximately 1130-1197. De penitentia et partibus eius.
Posture in worship--History of doctrines--Middle Ages, 600-1500.
Prayer--History of doctrines--Middle Ages, 600-1500.
Harvard subject headings:
Petrus, Cantor, approximately 1130-1197. De oratione et speciebus illius.
Petrus, Cantor, approximately 1130-1197. De penitentia et partibus eius
Posture in worship--History of doctrines--Middle Ages, 600-1500.
Prayer--History of doctrines--Middle Ages, 600-1500.
Princeton subject headings:
Petrus, Cantor, approximately 1130-1197. De oratione et speciebus illius.
Petrus, Cantor, approximately 1130-1197. De penitentia et partibus eius.
Posture in worship--History of doctrines--Middle Ages, 600-1500.
Prayer--History of doctrines--Middle Ages, 600-1500.