Cipolla, Carlo M., author
Penguin, 1974
Buku Teks
McEvery, Colin, author
Facts On File, 1979
Buku Referensi
Livi-Bacci, Massimo
Blackwell, 1997
Buku Teks
by Timothy King [and others]
The John Hopkins University Press , 1974
Buku Teks
New York, N.Y. The Departement 1975,
Buku Teks