== Bibliography ==* "The Alphabet: A Key to the History of Mankind"; ISBN 81-215-0748-0* "History of the Alphabet", 1977; ISBN 0-905418-12-3* "The Alphabet", ISBN 0-09-067642-4* "The Illuminated Book"; ISBN 0-571-08077-4* "The Story of the Aleph Beth", 1958
* History of the Alphabet, 1977; ISBN 0-905418-12-3* The Book Before Printing: Ancient, Medieval and Oriental; ISBN 0-486-24243-9* The Alphabet, ISBN 0-09-067642-4* The Illuminated Book; ISBN 0-571-08077-4* The Story of the Aleph Beth, 1958