Page 35, Paranormal Media: Audiences, Spirits and Magic in Popular Culture, Author: Annette Hill, Publisher: Routledge, 2010, ISBN9781136863189, ...One public lecture titled 'Gossip about Ghost' by former chemist George Tweedie claimed 'spook hunting has recently become as fashionable as Slumming'...
Page 220, The Chemical News and Journal of Industrial Science; with which is Incorporated the "Chemical Gazette.": A Journal of Practical Chemistry in All Its Applications to Pharmacy, Arts and Manufactures, Volume 37, Contributor: William Crookes, Publisher:Chemical news office, 1878, ...A process for coating iron with magnetic oxide by the action of heated air. By George R. Tweedie...
Coyne, Patrick (January–February 2005). "Design Pioneers: Robert Abel". Comm Arts. Coyne & Blanchard, Inc. Archived from the original on October 9, 2007. Retrieved 2014-02-15.
Coyne, Patrick (January–February 2005). "Design Pioneers: Robert Abel". Comm Arts. Coyne & Blanchard, Inc. Archived from the original on October 9, 2007. Retrieved 2014-02-15.