Coe, Michael D.
Thames and Hudson, 2003
Buku Teks SO
Groslier, Bernard Philippe
Frederick A. Praeger, 1957
Buku Teks SO
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