Campball, Stanislaus, F.S.C..
From Breviary to Liturgy og the Hours: The Structural Reform of the Roman Office 1964-1971 /

. - Collegeville : The Liturgical Press; A pueblo Book,  1995 
. - xxi, 358 p.  23 cm. 
<br/><label>  ISBN: </label>0-8146-6133-5