Sources:

Tartans of Scotland - 1978, Lutterworth Press, Guildford and London

The History of Tartan - 2005, Anness Publishing Ltd - London

The Descendants of Captain John McCollough (1770-1847) And Anna Elizabeth Spangler (1779-1858) - 2006, Mark and Curtis McCollough

E-mail from Donald McCullough - Posted at: web.ukonline.co.uk/t.mcculloch/mcculloch/1.html

Scottish Clan & Family Encyclopedia - 1998, Barnes & Noble, Inc.

Clans and Families of Scotland - 1999, Chartwell Books