Charles Babbage (with Emily Morrison) (1956) My Father’s Watch (with Donald Holcomb (Prentice Hall, 1974) Morrison, Philip; Morrison, Phylis (1982).
New York: Wiley.  Charles Babbage (bersama dengan Emily Morrison) (1956) My Father’s Watch (bersama dengan Donald Holcomb (Prentice Hall, 1974) Morrison, Philip; Morrison, Phylis (1982).