Ralby, Aaron, author
Parragon Books, 2013
Buku Referensi
Keegan, John, author
Routledge, 1996
Buku Referensi
Keegan, John, author
Routledge, 1996
Buku Referensi
Seth, Michael J., author
Littlefield, 2011
Buku Teks
Black, Jeremy, author
Cambridge University Press, 1996
Buku Referensi