Bromberg, Andrew, author
Page One Publishing Private Limited, 2007
Buku Referensi
Aveling, Harry, author
Faculty of Humanities University of Indonesia, 2007
Artikel Jurnal
Buku Teks
Landy, Frank J., author
The Dorsey Press, 1980
Buku Teks
edited by P.J.D. Drenth ... [and others]
Wiley, 1984
Buku Teks