Duchet-Suchaux, Gaston
Flammarion, 1994
Buku Referensi
Buck, Pearl Sydenstricker, 1892-1973
A. Signet Book, 1971
Buku Teks
Missler, Chuck
Visimedia, 2006
Buku Teks
Jenney, Ray Freeman
Harper and Brothers , 1955
Buku Teks
Rinkes, D.A.
Malaysian sociological research institute (MSRI), 1996
Buku Teks