Wilder, Laura Ingalls, author
Harper Trophy, 2004
Buku Teks
Corbett, Edward P.J., author
Scott, Foresman and Company, 1983
Koleksi Publik
Sutherland, John, 1938-, author
Yale University Press, 2013
Buku Teks
Warburton, Nigel, 1962-, author
Yale University Press, 2012
Buku Teks
Williamson, Caspar, author
Chronicle Books, 2011
Buku Referensi