S'Gravenhage : Martinus Nijhoff
Majalah, Jurnal, Buletin
Cambridge University Press, 1965
Majalah, Jurnal, Buletin
Britis Combia : Canada and Evergreen Press
Majalah, Jurnal, Buletin
Edward Arnold ,
Majalah, Jurnal, Buletin
New York : The American Council on the Teaching of Foreign Language Inc
Majalah, Jurnal, Buletin