Referensi
- Bennett, William Holmes (1980). An Introduction to the Gothic Language. New York: Modern Language Association of America.
- Campbell, A. (1959). Old English Grammar. London: Oxford University Press.
- Cercignani, Fausto (1972). "Indo-European ē in Germanic". Zeitschrift für vergleichende Sprachforschung. 86 (1): 104–110.
- Cercignani, Fausto (1973). "Indo-European eu in Germanic". Indogermanische Forschungen. 78: 106–112.
- Cercignani, Fausto (1979). "Proto-Germanic */i/ and */e/ Revisited". Journal of English and Germanic Philology. 78 (1): 72–82.
- Krahe, Hans and Meid, Wolfgang. Germanische Sprachwissenschaft, 2 vols., de Gruyter, Berlin (1969).
- Orel, Vladimir (2003). A Handbook of Germanic Etymology. Leiden; Boston; Internet: Brill; Internet Archive.
- Plotkin, Vulf (2008). The Evolution of Germanic Phonological Systems: Proto-Germanic, Gothic, West Germanic, and Scandinavian. Lewiston: Edwin Mellen.
- Ramat, Anna Giacalone and Paolo Ramat (Eds.) (1998). The Indo-European Languages. Routledge. ISBN 0-415-06449-X.
- Ringe, Donald A. (2006). From Proto-Indo-European to Proto-Germanic. Linguistic history of English, v. 1. Oxford: Oxford University Press. ISBN 0-19-955229-0.
- Voyles, Joseph B. (1992). Early Germanic Grammar. San Diego: Academic Press. ISBN 0-12-728270-X.
- Guus, Kroonen (2013). Etymological Dictionary of Proto-Germanic. Leiden Indo-European Etymological Dictionary Series, 11. Brill Academic Publishers. ISBN 978-90-04-18340-7.
Pranala luar
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| Internasional | |
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| Nasional | |
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| Lain-lain | |
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