Eiland, Murray (2010). "Heraldry on German Notgeld". The Armiger's News. 23 (3): 1–3, 12. Archived from the original on 18 August 2023. Retrieved 26 December 2022– via academia.edu.
Eiland, Murray (2014). "Cigar box heraldry". The Armiger's News. 36 (1): 1–4. Archived from the original on 17 January 2023 – via academia.edu.
Beddoe (1981). Beddoe, Alan (1981). Galloway, Strome (ed.). Beddoe's Canadian Heraldry. Belleville, Ontario: Mika Publishing Company – via Internet Archive.
"Differencing a.k.a. Cadency". Journalists' & Authors' Guide to Heraldry and Titles. Baronage.co.uk. Archived from the original on 5 August 2012. Retrieved 19 June 2012.
Shepard (2006), p.36. Shepard, J. (2006). "Closer Encounters with the Byzantine World: The Rus at the Straits of Kerch". In Reyerson, Kathryn L.; Stavrou, Theofanis G.; Tracy, James D. (eds.). Pre-modern Russia and Its World: Essays in Honor of Thomas S. Noonan. Wiesbaden: Otto Harrassowitz Verlag. ISBN9783447054256.
Child (1976), p.21. Child, Heather (1976). Heraldic Design: A Handbook for Students. Genealogical Publishing Com. ISBN9780806300719.
Eiland, Murray (2010). "Heraldry on German Notgeld". The Armiger's News. 23 (3): 1–3, 12. Archived from the original on 18 August 2023. Retrieved 26 December 2022– via academia.edu.
"Differencing a.k.a. Cadency". Journalists' & Authors' Guide to Heraldry and Titles. Baronage.co.uk. Archived from the original on 5 August 2012. Retrieved 19 June 2012.
De Boo (1977). de Boo, J. A. (1977). Familiewapens, oud en nieuw. Een inleiding tot de Familieheraldiek[Family Coats of Arms, Old and New: An introduction to Family Heraldry] (in Dutch). The Hague: Centraal Bureau voor Genealogie. OCLC63382927.
Pama (1956). Pama, Cornelius (1956). Heraldiek in Suid-Afrika[Heraldry in South Africa] (in Afrikaans). Cape Town: Balkema. OCLC12781684.