Herminie Soemitro
University of Indonesia, Faculty of Humanities, 2003
Artikel Jurnal
Hartley, John
Routledge, 2002
Buku Teks SO
Lull, James
Yayasan Obor Indonesia, 1997
Buku Teks SO
Wilson, Stan Le Roy
McGraw-Hill, 1995
Buku Teks SO
Hartley, John
Cambridge University Press, 2006
Buku Teks SO