Buchter, Hugo H.,
John Wiley & Sons, 1979
Buku Teks
Lo, S.Y.
The Asian Development Bank, 1985
Buku Teks
edited by Dagmar Caganova, Michal Balog, Lucia Knapcíkova, Jakub Soviar, Serkan Mezarcıoz
Springer Nature, 2019
eBooks
edited by Arthur Cotterell
Oxford Oxford University Press , 1980
Buku Teks
Graff, Heinz
Edition Leipzig, 1972
Buku Teks