Jacques, Claude
Konemann Verlagsgessellschaft, 1999
Buku Referensi
Pym, Christopher
Robert Hale Limited, 195?
Buku Teks SO
C. M. Bhandari
White Orchid Press, 1995
Buku Teks SO
Jacques, Claude
China Konemann 1999,
Buku Referensi
Coe, Michael D.
Thames & Hudson, 2003
Buku Teks SO