Ulrich's International Periodicals Directory 1998 :  Including Irregular Serials and Annuals.  Vol. 2,  Classified List of Subjects E-L. 

 - New Jersey :  R. R. Bowker,  1997. 
 - L, 2310-4539 s. ;  29 cm. 
 - (The Bowker International Serials Database) .
<br/><br/><label>ISBN: </label>0835239691 
<br/><br/><label>Uniwersalna Klasyfikacja Dziesiętna: </label> 014:016(05)