New horizons world guide
edited by Gerald W. Whitted
Pan American World Airways, 1971
 Buku Referensi
New horizons world guide
edited by Gerald W. Whitted
Pan American World Airways, 1963
 Buku Referensi
Nicholson, Max
The environmental revolution : a guide for the new masters of the world
Penguin Books, 1970
 Buku Teks
Collins, V.D.
World marketing : a complete guide to world merchandising and selling of the new era
J.B. Lippincott, 1935
 Buku Teks SO
Drucker, Peter Ferdinand, 1909-2005
The new realities in government and politics in economy and business in society and in world view
Heinemann Profesional , 1990
 Buku Teks SO