Schulz, Ernest B
[publisher not identified], 1956
Buku Teks
Shi Biqiu, author
China Renmin University Press, 2015
eBooks
Arblaster, Anthony, author
Open University Press, 1987
Buku Teks
Hirst, Paul, author
Macmillan, 1979
Buku Teks
Chua, Leon O.
McGraw-Hill, 1987
Buku Teks