Russel, Bertrand, author
Routledge, 1948
Buku Teks
Rae, John B., author
McGraw-Hill, 1949
Buku Teks
Sorensen, Bent, author
Earthscan, 2011
Buku Teks
Keegan, John, author
Routledge, 1996
Buku Referensi
Keegan, John, author
Routledge, 1996
Buku Referensi