Romein, Jan, author
N.V.EM.Quirido`s, 1950
Buku Teks
France : Edisud
Majalah, Jurnal, Buletin
Engel, Thomas, author
Pearson Prentice Hall, 2008
Buku Teks
Sutton, Raul, author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Arya, Jagdish C., author
Prentice-Hall, 1979
Buku Teks