Hoff, Timothy J., author
Oxford University Press, 2016
eBooks
edited by E.L. Baum, Howard G. Diesslin and Earl O. Heady
Iowa State University Press, 1961
Buku Teks
Wilson, Bryan, author
I.B. Tauris , 2008
Buku Teks
Irwin, Terry
Churchill Livingstone, 2004
Multimedia
Thurow, Lester C., author
Wadsworth, 1970
Buku Teks