Crosby, Norman
Nicholson & Watson, 1948
Buku Teks
Marcos, Ferdinand E., author
Marcos Foundation , 1973
Buku Teks
Marcos, Ferdinand E., author
Marcos Foundation, 1974
Buku Teks
Kuala Lumpur : MBRAS (Malaysian Branch of the Royal Asiatic Society)
Majalah, Jurnal, Buletin
Morrison & Gibb, 1940
Buku Teks