Gray, William S.
Prentiee-Hall, 1996
Buku Teks
Coombs, William E.
F.W. Dodge Co. , 1958
Buku Teks
DeFranco, Agnes L., 1961-, author
John Wiley & Sons, 2007
Buku Teks
Goodlad, J.B., author
Heinemann, 1974
Buku Teks
Adrian, James J., author
Reston Publishing, 1979
Buku Teks