https://www.ptbm.co.uk/
PTBM
https://uhuhhhhh.blogspot.com/2012/10/simple-heraldy-cheerfully-illustrated.html
PTBM Research Journal: Simple Heraldy Cheerfully Illustrated - Iain Moncreiffe & Don Pottinger
art school blog - Print and Time Based Media, Wimbledon College of Art (UAL), 2013 - 2015.
research journalsimple