Marcos, E.Ferdinand
The Marcos Foundation, 1978
Buku Teks
Friedmann, Wolfgang, 1907-1972, author
Macmillan, 1951
Buku Teks
Wilson, Graham K., author
Chatham House, 1985
Buku Teks
Wang, James C.F., author
Prentice-Hall, 1985
Buku Teks
Singh, Bilveer, 1956-, author
McGraw-Hill, 2012
Buku Teks