Schils, Rene, author
[Springer, ], 2012
eBooks
Kruse, Kevin Michael, 1972-, author
Basic Books, 2015
Buku Teks
Niven, David, author
HarperCollins, 2003
Buku Teks
Watt, Homer A., author
Scott, Foresman and company , 1925
Buku Teks
Brosse, Jacques, author
Facts on File Publications, 1983
Buku Referensi