Anger, Arthur L.
Computer science : the PL/I language
John Wiley & Sons, 1972
 Buku Teks SO
Hartmann, Reinhard R.K.
Language of linguistics reflections on linguistic terminology, with particular reference to level and rank
Tubingen [Gunter Narr verlag] 1973
 Buku Teks
Bloomfield, Leonard
Introduction to the study of language by
Amsterdam John Benjamins Publishing 1983
 Buku Teks
Bloom, Lois
Language development and language disordes
New York John Wiley & Sons 1978
 Buku Teks
Lyons, John
Language and linguistics: an introduction/John Lyons
New York Cambridge University Press 1992,
 Buku Teks