International Business Machines Corporation, 1974
Buku Teks
Mcquillen, Kevin, author
Mike Murach & Associates, 1975
Buku Teks
Kane, Gerry, author
Osborne/McGraw-Hill, 1981
Buku Teks
Brearley, H.C., author
Macmillan, 1974
Buku Teks
Leventhal, Lance A., author
Mcraw-Hill, 1978
Buku Teks