Skousen, Mark, author
Routledge, 2015
eBooks
Gray, Alexander, author
Longmans , 1959
Buku Teks
Heilbroner, Robert L., author
Simon Schuster, 1961
Buku Teks
Morgan, Mary S., 1952-2011, author
Cambridge University Press, 2012
Buku Teks
Morgan, Mary S., 1952-2011, author
Cambridge University Press, 2012
Buku Teks