Dareau M., Pike l. and Watson, H (eds) (2002) "A Dictionary of the Older Scottish Tongue" Vol. XII, Oxford University Press. p. xxxiv
glottolog.org
Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian (编). High German. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History. 2016.