Brennan, Niall, 1918-2005
Hill Publishing, 1972
Buku Teks SO
Campion, Edmund
Penguin Books, 1987
Buku Teks SO
Ople, Blas F.
Department of Foreign Affairs Republic of the Philippines, 2002
Buku Teks
Zimmermann, Warren
Farrar Strauss and Giroux, 2002
Buku Teks
Galbraith, John Kenneth, 1908-2006
Sinclair-Stevenson, 1994
Buku Teks