Herring, Hubert, author
Alfred A. Knopf, 1968
Buku Teks
Herring, Hubert, author
Alfred A. Knopf, 1956
Buku Teks
Pare, Richard, author
Callaway Editions, 1982
Buku Teks
Sorensen, Bent, author
Earthscan, 2011
Buku Teks
Keegan, John, author
Routledge, 1996
Buku Referensi