Kerrigan, Michael
Leicestershire Southwater, 2011
Buku Referensi
Purinton, Carl E.
The Ronald Press, 1961
Buku Teks
Sumanto Al Qurtuby, author
Center for Southeast Asian Studies, Kyoto University, 2015
Artikel Jurnal
Staub, Dick, author
John Wiley & Sons Inc., 2007
Buku Teks
Beasley, Norman
Buell, Sloan and Pearce, 1952
Buku Teks