1. 
   ISSN
   International Standard Serial Number
   Found op http://www.encyclo.co.uk/visitor-contributions.php
   
   
2. 
   ISSN
   International Society of Sports Nutrition
   Found op http://www.encyclo.co.uk/local/20895
   
   
3. 
   ISSN
   International Standard Serial Number assigned by the Library of Congress in Washington DC to magazines, newsletters, and other serials requesting it.
   Found op http://www.e-printing.co.uk/glossary.htm
   
   
4. 
   issn
   1) International standard serial number
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/issn/1
   
   

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