Socin, A
G.E. Stechert, 1942
Buku Teks
Clewlow, Carol, author
Lonely Planet, 1989
Buku Referensi
Smith, J. N., author
Batavia: Nijhoff Albrecht, 1926
Buku Teks
Smith, J. N., author
'S Gravenhage; Albert Rusche & Co; M. Nijhoff, 1926
Buku Klasik
Esser, B.J., author
G. Kolff, [date of publication not identified]
Buku Klasik