Gardiner, Alan (1957) Egyptian Grammar: Being an Introduction to the Study of Hieroglyphs, third edition, Oxford: Griffith Institute, âISBN, page 527
Henry George Fischer (1988) Ancient Egyptian Calligraphy: A Beginnerâs Guide to Writing Hieroglyphs, New York: Metropolitan Museum of Art, âISBN, pages 49â50
^ Henry George Fischer (1988) Ancient Egyptian Calligraphy: A Beginnerâs Guide to Writing Hieroglyphs, New York: Metropolitan Museum of Art, âISBN, pages 49-50