MoniteursPublishers, Amsterdam, 2011, ISBN 978-90-6369-228-5, S. 158 Ami Miyazaki: Pictogram & Icon Graphics 2. Pie Books, Tokyo, 2007, ISBN 978-4-89444-585-7, S.
Geschichte des AlphabetsHieroglyphs & Pictograms. Thames & Hudson, New York 1995, S. 170. Andrew Robinson: The Story of Writing: Alphabets, Hieroglyphs & Pictograms. Thames & Hudson