The American pronouncing dictionary of troublesome words
edited by Frank O. Colby
Thomas Y. Crowell, 1950
 Buku Referensi
Jones, Daniel
Cambridge english pronouncing dictionary
Cambridge University Press, 2003
 Buku Teks
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