Country Beautiful Foundation, 1966
Buku Teks
Fisher, Carrie, author
POP, 2018
Buku Teks
Burgess, Anthony, author
Thames and Hudson, 1986
Buku Teks
Eisenhouwer, David
Vintage Books, 1987
Buku Teks
Mulfinger, Dale
Minnesota Historical Society Press, 1995
Buku Teks