Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, ур. (2016). „West Germanic”. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.
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Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, ур. (2016). „West Germanic”. Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.