Herminie Soemitro
University of Indonesia, Faculty of Humanities, 2003
Artikel Jurnal
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
Vincentia Irmayanti Meliono
Faculty of Humanities University of Indonesia, 2003
Artikel Jurnal