Pelto, Pertti J
Cambridge University Press, 1978
eBooks
Weitzman, David
Charles Seribner's Sond, 1994
Buku Referensi
Frieda Dharmaperwira-Amran
Yayasan Obor Indonesia, 1997
Buku Teks
Kuper, Adam
Pica Press, 1973
Buku Teks
Lively, Penelope
HarperFlamingo, Ringwood Pinguin Books 1999
Buku Teks