Proceedings of the National Academy of Sciences of the United States of America 

 - New York, USA  JSTOR 
 - On-campus e-Journal under Digital Library Program of Higher Education Commission (HEC) of Pakistan 
<br/><br/><label>ISSN: </label>00-227001 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Proceedings - National Academy - Sciences - United States - America