Rosenthal, Marilyn S.
Longman photo dictionary
Longman Inc., 1987
 Buku Referensi
Smith, Jennifer
English for study purposes: teacher's guide
Macmillan, 1982
 Buku Teks
Pollmann, Friedrich
Macmillan Lensing new basic dictionary
Macmillan, 1976
 Buku Referensi
Hopkins, Diana
Cambridge grammar for ielts with answers: self-study grammar reference and practice
Cambridge University Press, 2011
 Buku Teks SO
Walters, Margan L
Intermediate dictionary of American english
N.Y.Holt,Rinehart and winston,ic, 1966
 Buku Teks