Yeager, Selena, author
Bantam Books, 1998
Buku Teks
Wilder, Thornton, 1897-1975, author
Bantam Books, 1961
Buku Teks
Christian, Barbara.
Greenwood Press, 1980.
Buku Teks
Handy, Willowdean C.
Australian National University Press,, 1973
Buku Teks
Watt, Homer A., author
Scott, Foresman and company , 1925
Buku Teks