Catholic Church. Pope (1978-2005 : John Paul II) & John Paul II, P. (1980). Letter of the Supreme Pontiff, Pope John Paul II, to all the bishops of the Church on the mystery and worship of the Holy Eucharist. Vatican Polyglot Press.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1978-2005 : John Paul II) and Pope John Paul II. Letter of the Supreme Pontiff, Pope John Paul II, to All the Bishops of the Church on the Mystery and Worship of the Holy Eucharist. [Vatican City]: Vatican Polyglot Press, 1980.
MLA (8th ed.) CitationCatholic Church. Pope (1978-2005 : John Paul II) and Pope John Paul II. Letter of the Supreme Pontiff, Pope John Paul II, to All the Bishops of the Church on the Mystery and Worship of the Holy Eucharist. Vatican Polyglot Press, 1980.
Warning: These citations may not always be 100% accurate.