Carnevale, Anthony P.
Dept. of Education, Office Educational Research and Improvement , 1994
Buku Teks
Pierson, Frank C.
McGraw-Hill, 1959
Buku Teks
Marland, Sidney P., author
McGraw-Hill, 1974
Buku Teks
Regan, William
Harper & Row, Publishers, 1970
Buku Teks
Bestor, Arthur
Knopf, 1956
Buku Teks