United Nations Development Program
Jakarta: United Nations Development Program, 1994,
Buku Referensi
by H.B. Chenery ... [et al.]
Universitaire Pers Rotterdam, 1967
Buku Teks
Organization for Economic Co-operation and Development, 1965
Buku Teks
Alexander-Frutschi, author
Stanford Research Institute, 1963
Buku Teks
Carlson, Sune, author
Svenska Bokforlaget, 1964
Buku Teks