Sprey, K.
Het rijk van Rome de bijdrage van Rome tot de cultuur van West-Europa
's-Gravenhage Servire 1950
 Buku Teks
Ward, Barbara
Towards a world of plenty / Barbara Ward
University of Toronto Press , 1963
 Buku Teks
Ward, Barbara
Human settlemants:crisis and opprtunity / Barbara Ward
the Honou Rable Ron Basford, 1976
 Buku Teks
Ward, Barbara
Five ideas that change the world / Barbara Ward
W.W. Norton & Company, 1959
 Buku Teks
Power, Jonathan
Development economics / Jonathan Power, foreward by Ward Barbara
Longman, 1971
 Buku Teks