Hammond, Kenneth R.
Knopf, 1963
Buku Teks
Shavelson, Richard J.
Allyn and Bacon , 1988
Buku Teks
Edwards, Allen L.
Holt, Rinehart and Winston, 1966
Buku Teks
Kiess, Harold O.
Allyn And Bacob, 1989
Buku Teks
Adkins, Dorothy C.
Charles E. Merrill Books , 1964
Buku Teks