APA (7th ed.) Citation

Castle, T., & McGrath, P. (2002). On this rock: The popes and their times; St Peter to John Paul II. St. Pauls.

Chicago Style (17th ed.) Citation

Castle, Tony, and Peter McGrath. On This Rock: The Popes and Their Times; St Peter to John Paul II. London: St. Pauls, 2002.

MLA (8th ed.) Citation

Castle, Tony, and Peter McGrath. On This Rock: The Popes and Their Times; St Peter to John Paul II. St. Pauls, 2002.

Warning: These citations may not always be 100% accurate.