Carlson, Neil R.
Allyn and Bacon, [date of publication not identified]
Buku Teks
Carlson, Neil R.
[publisher not identified], 1997
Buku Teks
Carlson, Neil R.
Allyn and Bacon, 1993
Buku Teks
Santrock, John W.
W.C. Brown Publisher, 1991
Buku Referensi
Isaacson, Robert L.
Harper & Row, 1965
Buku Teks SO