editor John Bresnan; penerjemah Sonny Wyarso Amiluhur [and others]
Gramedia, 1988
Buku Teks
Forbes, Cameron W.
Houghton Miffiln, 1928
Buku Klasik
Marcos, Ferdinand E., author
Marcos Foundation, 1974
Buku Teks
Laquian, Aprodicio A., author
University of Philippines, 1966
Buku Teks
edited by Trevor Wilson
ISEAS, 2006
Buku Teks