Eckhardt, Robert B.
McGraw-Hill, 1979
Buku Teks
Richardson, W. Norman
Macmillan, 1976
Buku Teks
Keenleyside, Anne
W. Ross MacDonald School Resource Services Library, 2015
Buku Teks
Pawson, Ivan G.
John Wiley & Sons, 1977
Buku Teks
Watson, Richard A.
Harcourt, Brace and World, 1969
Buku Teks