Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Holman, Michael and Kovatchéva, Mira",Bulgarian : a complete course for beginners,,"Hodder & Stoughton,NTC/Contemporary Publishing",1993,Teach yourself books,,"0844238538,0844237531",,https://cir.nii.ac.jp/crid/1130000795180151168