Catholic Church. Pope & Biblioteca apostolica vaticana. (1929). Pontificvm romanorvm diplomata papyracea qvae svpersavnt in tabvlariis Hispaniae, Italiae, Germaniae phototypice expressa ivssv Pii pp: XI. apvd Bybliothecam vaticanam.
Chicago Style (17th ed.) CitationCatholic Church. Pope and Biblioteca apostolica vaticana. Pontificvm Romanorvm Diplomata Papyracea Qvae Svpersavnt in Tabvlariis Hispaniae, Italiae, Germaniae Phototypice Expressa Ivssv Pii Pp: XI. Romæ: apvd Bybliothecam vaticanam, 1929.
MLA (8th ed.) CitationCatholic Church. Pope and Biblioteca apostolica vaticana. Pontificvm Romanorvm Diplomata Papyracea Qvae Svpersavnt in Tabvlariis Hispaniae, Italiae, Germaniae Phototypice Expressa Ivssv Pii Pp: XI. apvd Bybliothecam vaticanam, 1929.
Warning: These citations may not always be 100% accurate.