Pepper, Stephen C.
World hypotheses: a study in evidence
University of California Press, 1966
 Buku Teks
The World of Ideas: essays for study
edited by Michael W. Alssid, William Kenney
Holt, Rinehart and Winston, 1964
 Buku Teks
World insolvency systems : a comparative study
Otto Eduardo Fonseca Lobo
Carswell , 2009
 Buku Teks
Bull, Hedley
The anarchical society: a study of order in world politics
Macmillan, 1995
 Buku Teks
Lluch, Constantino
Indonesia wages and employment: (world bank country study)
World Bank , 1985
 Buku Teks