Source: PL-PŁsem MsEPl 12 Antyfonarz z Płocka, pars de temporeFolio: 001vSequence: 1Feast: Nativitas DominiOffice: MGenre: VPosition: 01Cantus ID: 006411aMode: 1SFull text: Tamquam sponsus dominus procedens de thalamo suo