Martinus Nijhoff Publishers, 1996
Buku Teks
Ember, Carol R., author
Prentice-Hall, 1985
Buku Teks
Haviland, William A., author
Rinehart and Winston, 1974
Buku Teks
Beals, Ralph L., author
Macmillan, 1959
Buku Teks
Haviland, William A., author
Erlangga, 1988
Buku Teks