Keegan, William F., author
Oxford University Press, 2017
eBooks
Sage Publications, 1987
Buku Teks
Morison, Samuel Eliot, author
Little, Brown, 1955
Buku Teks
Wiarda, Howard J., author
Westview Press, 1992
Buku Teks
Hanke, Lewis
D. Van Nostrand Company, 1959
Buku Teks