1. B. W. Kernighan and D. M. Ritchie, The C Programming Language, Prentice-Hall, N. J. (1978).
2. B. W. Kernighan, Ratfor: A Preprocessor for a Rational Fortran, Software - Practice and Experience, 5, pp. 395-496 (1975).
3. S. C. Johnson, Yacc: Yet Another Compiler Compiler, Computing Science Technical Report No. 32, 1975,
4. A. V. Aho and M. J. Corasick, Efficient String Matching: An Aid to Bibliographic Search, Comm. ACM 18, 333-340 (1975).
5. B. W. Kernighan, D. M. Ritchie and K. L. Thompson, QED Text Editor, Computing Science Technical Report No. 5, 1972,
6. D. M. Ritchie, private communication. See also M. E. Lesk, The Portable C Library, Computing Science Technical Report No. 31,