Sharow, Alexander S., author
Cambridge University Press, 1989
Buku Teks
Gribbin, John, author
Penguin Book, 1998
Buku Teks
Mulfinger, Dale
Minnesota Historical Society Press, 1995
Buku Teks
Hall, J.C.
London Longmans 1956
Buku Teks
Campert, Remco, 1929 -, author
De Bezige Bij, 1995
Buku Teks