Stoff, Sheldon Ptaschevitch, author
Harper & Row , 1969
Buku Teks
Marland, Sidney P., author
McGraw-Hill, 1974
Buku Teks
Hallahan, Daniel P., author
Allyn and Bacon, 1994
Buku Teks
Degenova, Mary Kay, author
McGraw-Hill, 2008
Buku Teks
Pierson, Frank C.
McGraw-Hill, 1959
Buku Teks