Gummere, F. B. Article on Ballads in the Cambridge History of English Literature. 1908.
Henderson, T. F. The Ballad in Literature. (Cambridge Manuals.) 1912.
Ker, W. P. Epic and Romance. 1897.
Olrik, A. Danske Folkeviser i Udvalg, og Indledning. 1912.
Pineau, L. Les Vieux Chants Populaires Scandinaves. 1898.
Vigfusson, G., and Powell, F. York. Corpus Poeticum Boreale. 2 volumes. 1883.