1. Allen , Thomas J ,Managing the Flow of Technology, The MTT Press , Cambridge MA , p. 238 – 239 ( 1977 ).
2. Naval Ship Production: A Claim Settled and a Framework Built
3. Hax , Amoldo C. , Majluf , Nicholas S ,Strategic Management, Prentice-Hall , Englewood Cliffs , NJ , p. 1ll ( 1984 ).