Lang, Tran Tien
John Wiley & Sons, 1987
Buku Teks
Mottershead, Allen
Prentice-Hall, 1990
Buku Teks
Calvert, J.M.
John Wiley & Sons, 1978
Buku Teks
Hussain, K.M.
Organization for Economic Co-operation and Development , 1976
Buku Teks
edited by Janos Fischer and C.R. Ganellin
Wiley-VCH, 2006
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