Coyne, G. V. (1983). Gregorian reform of the calendar: Proceedings of Vatican conference to commemorate its 400. anniversary, 1582 - 1982. Specola Vaticana.
Chicago Style (17th ed.) CitationCoyne, George V. Gregorian Reform of the Calendar: Proceedings of Vatican Conference to Commemorate Its 400. Anniversary, 1582 - 1982. Città del Vaticano: Specola Vaticana, 1983.
MLA (9th ed.) CitationCoyne, George V. Gregorian Reform of the Calendar: Proceedings of Vatican Conference to Commemorate Its 400. Anniversary, 1582 - 1982. Specola Vaticana, 1983.
Warning: These citations may not always be 100% accurate.