Ormeling, Ferdinand Jan
The Timor problem: a geographical interpretation of an underdeveloped island
J. B. Wolters, 1955
 Buku Teks SO
Shannon, Lyle W.
Underdeveloped areas a book of readings and research / Lyle W. Shannon
Harper & Row , 1957
 Buku Teks
The progress of underdeveloped areas
edited by Bert F. Hoselitz
University of Chicago Press, 1952
 Buku Teks SO
Fituni, L.A.
Economically underdeveloped countries and the west
Progress Publishers, 1963
 Buku Teks
The progress of underdeveloped areas
edited by Bert F. Hoselitz
University of Chicago Press, 1952
 Buku Teks