If you are looking for book...
Q OPAC

If you are looking for an  article...
  Reporter – bulgarian newspapers database.
  Serials Collection Modulus - Bulgarian serials collection content.
  EBSCO - online access to full-text serials collection.
 Bibliosphere - NBU Library electronic magazine.

If you are looking for a diploma paper...
Diploma papers Modulus - the database represents the work of students from New Bulgarian University.
ProQuest Dissertation Abstract - the database is a single, authoritative source for information about doctoral dissertations and master's theses.

If you are looking for a dictionary...
Oxford English Dictionary Online - the world's leading authority on the history and development of the English language since 1150.
Other reference resources – selected online encyclopedias and dictionaries.

If you are looking for...
  Archival documents Modulus  - provides access to archival documents inventory posessed by Library and scanned image of some of them.

If you are looking for legal information...
  CELEX - the official legal data base of European Union.

If you are looking for Internet resources ...
 Internet library - access to selected academic sites concerning

  Loans
  Holding a book
  Information Reference
  Written Subject Reference List  
  Interlibrary Loan  
  International Interlibrary Loan 
  Alerting Information
  Internet access 
  Copying services