Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL
"Conference in Hispanic Studies, 2d, Gregynog Hall, 1970 and Shergold, N. D.",Studies of the Spanish and Portuguese ballad,,"Tamesis,University of Wales Press",1972,Colección Támesis,,0900411392,,https://cir.nii.ac.jp/crid/1130282271827436288