Keegan, Warren J., author
Alex Media Komputindo, 1992
Buku Teks
Keegan, Warren J., author
Alex Media Komputindo, 1992
Buku Teks
Keegan, Warren J., author
Prenhallindo , 1996
Buku Teks
Keegan, Warren J., author
Prentice Hall International, 1989
Buku Teks
Keegan, Warren J., author
Prentice Hall International, 1995
Buku Teks