Jones, Daniel
English pronouncing dictionary
Cambridge University Press, 1992
 Buku Referensi
Kenyon, John Samuel
A pronouncing dictionary of American English
Merriam-Webster ; G. & C. Merriam Co., 1953
 Buku Referensi
Jones, Daniel
English pronouncing dictionary
Everymans`s Reference Library, 1956
 Buku Teks SO
Jones, Daniel
Cambridge english pronouncing dictionary
Cambridge University Press, 2003
 Buku Teks
Michael McCarthy
english vocabulary in Use
1999
 Buku Teks