@Article{532789,
     author = "Jerzy Bisztyga",
     title = "Officium divinum od IV do XIII wieku",
     year =  2014,
     volume =  20,
     number =  2(44),
     journal =  Liturgia Sacra. Liturgia - Musica - Ars,
     pages =  s. 303-333,
    }