Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Beinhauer, Werner and Alonso, Dámaso and Huarte Morton, Fernando",El español coloquial,"2a ed. cor., aum. y actualizada",Gredos,1973,Biblioteca románica hispánica,,"842490513X,8424905148",,https://cir.nii.ac.jp/crid/1130848328658911104