Chomsky, Noam
Fontana/Collins , 1975
Buku Teks SO
Danbury : Lexicon Publications, Inc., 2004,
Buku Referensi
Sambrook, G.A.
Longmans, Green, 1947
Buku Teks SO
Sambrook, G.A.
Longmans Green & Co, 1947
Buku Teks SO
Chomsky, Noam
New Press, 1998
Buku Teks SO