Wilder
Gramedia, 1956
Buku Teks
Harlow, Ralph Volney, author
Holt, Rinehart and Winston,Inc, 1964
Buku Teks
Walker, Kenneth, author
Oxford University Press, 1955
Buku Teks
Cullen, Robert, 1949-, author
Ivy Books, 1994
Buku Teks
Eichner, Bill, author
Chelsea Green Publishing Company, 2001
Buku Teks