Artikel Jurnal
Spooner, F.P.
Fredereck A.Praeger Publisher, 1960
Buku Teks
Korniawan, R., author
The Journal Publishing, 2022
Buku Teks
edited by Peter Godwin
UNDP Regional Project on HIV and Development, 1997
Buku Teks
D. Reidel Publishing Company, 1985
Buku Teks