1. 1
    Izdano 1970
    ...National Agricultural Library,...
    Connect to database
    Elektronski Serijska publikacija
  2. 2
    Izdano 2010
    ...American Library Association,...
    Connect to electronic resource
    Elektronski Website
  3. 3
    Izdano 1989
    ...British Library Document Supply Centre,...
    Elektronski Revija
  4. 4
    ...Cataloging Distribution Service, Library of Congress...
    Reference Material