Katz, Bill, author
R.R. Bowker Company, 1986
Buku Referensi
Katz, Bill, author
R.R. Bowker, 1989
Buku Referensi
Jeffrie Geovanie, 2014
Majalah, Jurnal, Buletin
Dick, Jill, author
A and C Black, 1994
Buku Teks
Hammer, Bjarne, author
Roads, 2014
Buku Referensi