National Archives of Malaysia, 2005
Buku Referensi
Turnbull, C. M. (Constance Mary), author
The Athlone Press, 1972
Buku Teks
Artikel Jurnal
Vaughan, J. D.
Oxford University Press , 1985
Buku Teks
Caminos, Hugo, author
United Kingdom Cambridge University Press, 2014
Buku Teks