References: (Listed alphabetically)
- Appleby, D. and Van de Kopple, J.J. (1997).
 - Programming Languages: Paradigm and Practice, 2nd Ed.
- McGraw-Hill.
  - Bal, H.E. and Grune, D. (1988).
 - Programming Language Essentials.
- Addison-Wesley.
  - Sebesta, R. (1999).
 - Concepts of Programming Languages, 4th Ed.
- Addison-Wesley.
  - Sethi, R. (1996).
 - Programming Languages: Concepts and Constructs, 2nd Ed.
- Addison-Wesley.
  - Wilson, L.B. and Clark, R.G. (1993).
 - Programming Languages: Concepts and Constructs, 2nd Ed.
- Addison-Wesley.
   
 
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