Rajagukguk, Omas Bulan
Contraceptive choice in Indonesia : 1987 and 1981
Journal of Population, 1995
 Artikel Jurnal
Public choice & rural development
resources for the future, 1981
 Buku Teks SO
Choosing a contraceptive : method choice in Asia and the United States
edited by Rodolfo A. Bulatao, James A. Palmore, and Sandra E. Ward
Westview Press, 1989
 Buku Teks
Dunphy, Dexter C.
Organizational change by choice
McGraw-Hill, 1985
 Buku Teks
Jähne, Johannes
Construction of roads and tracks in rural areas
Leipzig, 1964
 Buku Teks SO