Cornog, Mary Wood
Merriam-Webster?s vocabulary builder
Merriam-Webster Inc., 1994
 Buku Referensi
Hanyu 8000 ci cidian (A dictionary of Chinese usage:8000 words) HSK:Zhonggud hanyu shuiping kaoshi cindi dagang (Cinese proficency test vocabulary guideline) editor
Beijing Beijing Yuyan Wenhua Daxuie Chubanshe 2000
 Buku Referensi
Mackie, Benita
Building sentences
Upper Saddle River,N.J. Prentice Hall 1995,
 Buku Teks
English workshop
New York : Holt, Rinehart and Winston, 1995,
 Buku Teks
English grammatical structure : a general syllabus for teachers / L.G. Alexander...[et al.]
Longman Group UK Limited , 1975
 Buku Teks SO