Schild, Herbert
Teach yourself C
McGraw-Hill, 1997
 Buku Teks
Computer science: the PL/1 language
Athur L. Anger...[et.al]
John Wiley & Sons, 1972
 Buku Teks
Anger, Arthur L.
Computer science : the PL/I language
John Wiley & Sons, 1972
 Buku Teks
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