Summers, Della
Longman active study dictionary
Pearson Education Limited, 2010
 Multimedia
Rosenthal, Marilyn S.
Longman photo dictionary
Longman Inc., 1987
 Buku Referensi
Jones, Leo
Let's talk 3 : self-study audio CD
Cambridge University Press, 2008
 Multimedia
Smith, Jennifer
English for study purposes: teacher's guide
Macmillan, 1982
 Buku Teks SO
Pollmann, Friedrich
Macmillan Lensing new basic dictionary
Macmillan, 1976
 Buku Referensi