APA
Montani N. A., Society of St. Gregory of America. [from old catalog], . (1966). The St. Gregory hymnal and Catholic choir book. Philadelphia: St. Gregory Guild.
Chicago
Montani Nicola A, Society of St. Gregory of America. [from old catalog], . 1966. The St. Gregory hymnal and Catholic choir book. Philadelphia: St. Gregory Guild.
Harvard
Montani N. A., Society of St. Gregory of America. [from old catalog], . (1966). The St. Gregory hymnal and Catholic choir book. Philadelphia: St. Gregory Guild.
MLA
Montani Nicola A, Society of St. Gregory of America. [from old catalog], . The St. Gregory hymnal and Catholic choir book. Philadelphia: St. Gregory Guild. 1966.