The Crosier Calendar: Its Content and Development

Hentges, James E., O.S.C.. The Crosier Calendar: Its Content and Development / . - Romae : Excerptum ad Doctoratum Sacre Liturgiae assequendum in, 1993 . - 230 p. 25 cm. - ((Pontificium Athenaeum S. Anselmi de Urbe Pontificium )