Foundation for Rural Education and Development (FRED) (June 12, 1999, 1999
Buku Teks
North Corolina : The American Biographical Institute, 1986,
Buku Referensi
Rola, Agnes C, author
ISEAS & SEARCA, 2011
Buku Teks
Rola, Agnes C., author
Institute of South East Asia Studies, 2011
eBooks
Selo Soemardjan, author
Cornell University , 1963
Buku Teks