Gaya APA

STEINER, R., YEOMAN, I, (, (. (1999). Studies in Gregorian Chant . Aldershot: Ashgate.

Gaya MLA

STEINER, Ruth., YEOMAN, Ian, (et.al.), (ed.). "Studies in Gregorian Chant". Aldershot: Ashgate, 1999. Buku Teks.