Spectrum, 1951
Buku Referensi
Langacker, Ronald W.
Harcourt, Brace & World, 1968
Buku Teks
Vachek, Josef
Indiana University Press, 1966
Buku Teks
Fabb, Nigel
Camridge University Press , 2002
Buku Teks
Lyons, John
Cambridge University Press, 1991
Buku Teks