Pacem in terris encyclical letter of his holiness Pope John XXIII

MLA

John, and William J Gibbons. Pacem In Terris: Encyclical Letter of His Holiness Pope John Xxiii. New York (N.Y.): Paulist, 1963.

APA

John, J., & Gibbons, W. J. (1963). Pacem in terris: encyclical letter of his holiness Pope John XXIII. New York (N.Y.): Paulist.

Chicago

John Pacem In Terris: Encyclical Letter of His Holiness Pope John XXIII. Edited by William J Gibbons. New York (N.Y.): Paulist, 1963.