7 1 50 Vincent all Toro Additional Author mixed material Prentice Hall 1975 David Brown Additional Author E.D Halmilton III Additional Author mixed material Macmillan 1984 Paul C Krause Additional Author Oleg Wasynczuk Additional Author mixed material McGraw Hill 1989 Paul C Kranse Additional Author Oleg Wasynczuk Additional Author mixed material McGraw Hill 1989 Paul C Krause Additional Author Oleg Wasynczuk Additional Author mixed material McGraw Hill 1989 Herman E. Koenig Additional Author William A. Blackwell Additional Author mixed material McGraw Hill 1961 S.A.Nasar Additional Author L.E.Unnewehr Additional Author mixed material John Wiley & Sons 1979