Gaya APA

Riga, P. (1964). Peace on earth: a commentary on Pope John's Encyclical. Foreword by Léon-Joseph Suenens. . New York: Herder & Herder.

Gaya MLA

Riga, Peter. "Peace on earth: a commentary on Pope John's Encyclical. Foreword by Léon-Joseph Suenens. ". New York: Herder & Herder, 1964. Buku.