Sonnenschein, William Swan, author
George Routledge and Sons, 1969
Buku Referensi
Ingold, Tim, 1948-, author
Routledge, 2018
Buku Teks
Ember, Carol R., author
Prentice-Hall, 1985
Buku Teks
Haviland, William A., author
Rinehart and Winston, 1974
Buku Teks
George Routledge and Sons, 1969
Buku Referensi