Hornyold, J. J. (1821). The real principles of Catholics: Or, a catechism by way of general instruction, explaining the principal points of the doctrine and ceremonies of the Catholic Church (4th ed.). Printed by R. Coyne.

Hornyold, John Joseph. The Real Principles of Catholics: Or, a Catechism by Way of General Instruction, Explaining the Principal Points of the Doctrine and Ceremonies of the Catholic Church. 4th ed. Printed by R. Coyne, 1821.