Keegan, Warren J., author
Prentice Hall International, 1995
Buku Teks
Keegan, Warren J., author
Prentice Hall International, 1989
Buku Teks
Keegan, Warren J., author
Alex Media Komputindo, 1992
Buku Teks
Keegan, Warren J., author
Alex Media Komputindo, 1992
Buku Teks
Boyd, Harper W., Jr., author
Irwin, 1995
Buku Teks