Source: PL-PŁsem MsEPl 15 Antyfonarz z Płocka, pars de sanctisFolio: 120rSequence: 2Feast: Nativitas MariaeOffice: LGenre: APosition: BCantus ID: 003853Mode: 8Differentia: G1Full text: Nativitatem hodiernam perpetuae virginis genetricis dei Mariae sollemniter celebremus qua celsitudo throni processit alleluia