Burgschmidt, Ernst
Dortmund Lambert Lensing 1975
Buku Teks
Burgschmidt, Ernst
Dortmund Lambert Lensing 1975
Buku Teks
Oxford University Press,
Majalah, Jurnal, Buletin
Singapore : The SEAMEO Regional English Language Centre
Majalah, Jurnal, Buletin
New York : Holt, Rinehart and Winston, 1995,
Buku Teks