Pius X, P. (1923). Letter to Catholic Priests by His Holiness Pope Pius X of Happy Memory written on the fiftieth anniversary of his priesthood / with a preface by His Eminence Cardinal Bourne. London.
Chicago Style (17th ed.) CitationPius X, Pope. Letter to Catholic Priests by His Holiness Pope Pius X of Happy Memory Written on the Fiftieth Anniversary of His Priesthood / with a Preface by His Eminence Cardinal Bourne. London, 1923.
MLA (8th ed.) CitationPius X, Pope. Letter to Catholic Priests by His Holiness Pope Pius X of Happy Memory Written on the Fiftieth Anniversary of His Priesthood / with a Preface by His Eminence Cardinal Bourne. London, 1923.
Warning: These citations may not always be 100% accurate.