Fenno, Richard F.
Harvard University Press, 1959
Buku Teks
Pople, Maureen
St.Lucia:University of Queenssland, 1986
Buku Teks
edited by Penny Kaganoff and Susan Spano
Harcourt Brace & Company, 1997
Buku Teks
Soebagijo I.N. (Ilham Notodidjojo), 1924-, author
Gunung Agung, 1980
Buku Teks
Clarke, Arthur C.
VGSF , 1987
Buku Teks