Marcos, Ferdinand E.
Marcos Foundation, 1974
Buku Teks SO
Marcos, Ferdinand E.
Marcos Foundation , 1973
Buku Teks SO
Ashford, Norman J.
Wiley, 1992
Buku Teks
Ashford, Norman J.
John Wiley & Sons, 1984
Buku Teks
Kuala Lumpur : MBRAS (Malaysian Branch of the Royal Asiatic Society)
Majalah, Jurnal, Buletin