Murphy, Robert F., author
Columbia University Press, 1972
Buku Teks
Tienke Ambar Wulandari, author
[publisher not identified], 2001
Buku Teks
Redfield, Robert, author
Westview Press, 1991
Buku Teks
Black, Robert H.
AGPS, 1972
Buku Teks
MacLaine, Allan H.
Twayne Publishers, 1965
Buku Teks