Belavendram, Nicolo
Prentice-Hall, 1995
Buku Teks
Broto, Carles, author
Linksbooks, 2012
Buku Referensi
Myerson, Jeremy, author
Laurence King, 2006
Buku Referensi
Rockport Publisher, 1997
Buku Referensi
Huchingson, R. Dale, author
McGraw-Hill, 1981
Buku Teks