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fără descrierea modificării
* ''Liber usualis'' (1953). Tournai: Desclée& Socii.
* [http://www.musicasacra.com/pdf/liberusualis.pdf Liber Usualis (1961) in PDF format] (115 MB)
* {{cite book | last = Apel | first = Willi | year = 1990 | title = ''Gregorian Chant | publisher = '' (1990) Willi Apel, Indiana University Press | location = , Bloomington, Indiana | isbn = , ISBN 0-253-20601-4}}
* {{ws|"[[s:Catholic Encyclopedia (1913)/Gregorian chant|Gregorian chant]]" in the 1913 ''Catholic Encyclopedia''}}, article by H. Bewerung.
* {{cite web
editor=|
isbn=0-02-872951-X}}
==External links==
