http://www.musicweb.uk.net/holbrooke/
http://www.musicweb.uk.net/holbrooke/scowcroft.htm
http://www.jstor.org/stable/732661
http://www.musicweb.uk.net/holbrooke/
http://www.musicweb.uk.net/classrev/2003/Nov03/Holbrook_wales.htm
http://www.musicweb.uk.net/holbrooke/scowcroft.htm
http://www.jstor.org/stable/732661