APA

Catholic Church, Mason J., Sammis F. R. & Magnum Photos i. (1964). Peace on earth: an encyclical letter of His Holiness Pope John XXIII. New York: Ridge Press/Odyssey Press.

Chicago

Catholic Church, Mason Jerry, Sammis Fred R and Magnum Photos inc. 1964. Peace on earth: an encyclical letter of His Holiness Pope John XXIII. New York: Ridge Press/Odyssey Press.

Harvard

Catholic Church, Mason J., Sammis F. R. and Magnum Photos i. (1964). Peace on earth: an encyclical letter of His Holiness Pope John XXIII. New York: Ridge Press/Odyssey Press.

MLA

Catholic Church, Mason Jerry, Sammis Fred R and Magnum Photos inc. Peace on earth: an encyclical letter of His Holiness Pope John XXIII. New York: Ridge Press/Odyssey Press. 1964.