Frank W. Hoffmann, "British Homophone Co., Ltd.", in Encyclopedia of Recorded Sound, Vol. 1. 2nd ed. (CRC Press, 2004):131; "Plaza", "LabelindexN-P". Archived from the original on 2010-09-14. Retrieved 2010-07-11.
"Archived copy". mgthomas.co.uk. Archived from the original on 13 September 2002. Retrieved 6 June 2022.{{cite web}}: CS1 maint: archived copy as title (link)
Frank W. Hoffmann, "British Homophone Co., Ltd.", in Encyclopedia of Recorded Sound, Vol. 1. 2nd ed. (CRC Press, 2004):131; "Plaza", "LabelindexN-P". Archived from the original on 2010-09-14. Retrieved 2010-07-11.
"Archived copy". mgthomas.co.uk. Archived from the original on 13 September 2002. Retrieved 6 June 2022.{{cite web}}: CS1 maint: archived copy as title (link)