1. Printing Technology, a Medium of Visual Communication;Adams,1977
2. Contested Documents and Forgeries;Brewster,1932
3. Cannons Report on the State of the Art of Printing Today. Printing Trades Journal. Kent: Benn Brothers Ltd. 1977: 6–10.
4. The Individuality of Rubber Stamps;Casey;Forensic Science International,1978
5. Processes of Graphic Reproduction in Printing;Curwen,1966