Ledger 

 - United States  University Library System, University of Pittsburgh 
<br/><br/><label>ISSN: </label>2379-5980 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Computer software | Social Sciences<br/> Electronic computers. Computer science<br/> Finance<br/> Instruments and machines<br/> Mathematics<br/>Science