Lawrence J Vale
Oxford University Press, 2005
Buku Teks
Oxford University Press, 2005
Buku Teks
Owen, Wilfred
The Brookings Institution, 1972
Buku Teks
edited by Peter J.M. Nas
Foris, 1986
Buku Teks
Atkinson, Rowland, author
Routledge, 2019
Buku Teks