Neumann 2010, p. 862. - Neumann, Günter (2010) [2000]. "Ingwäonen". Germanische Altertumskunde Online. de Gruyter. https://www.degruyter.com/database/GAO/entry/RGA_2700/html
Sonderegger, Stefan (1979). Grundzüge deutscher Sprachgeschichte. Diachronie des Sprachsystems, vol. I: Einführung – Genealogie – Konstanten. Berlin/New York: Walter de Gruyter; Ingerid Dal, "2.1: Altniderdeutsch u. seine Vorstufen" in Gerhard Cordes, Dieter Möhn, eds. Handbuch zur Niederdeutschen Sprach und Literaturwissenschaft.1983.
For Ing as an aspect of Freyr, see R. North, Heathen Gods in Old English Literature (Cambridge) 1997. https://books.google.com/books?id=X_LKUIqNvPQC&dq=Heathen+Gods+in+Old+English+Literature&pg=PP1
Noted by John Grigsby, Beowulf & Grendel (London: Watkins) 2005:98 note 6.
Hickes, Thesaurus of the Old Languages of the North, 1705, noted by Grigsby 2005:98.
John Grigsby provides the translation "Ing was among the East Danes first seen among men, til he departed [east? back?] over the sea; the wagon ran after; thus the hard-men [warriors?] named the hero." Grigsby notes the return journey in a wagon over the sea of this obliquely referred-to god: " the presence of this deity might have been allowed to remain in the otherwise Christian poem on the grounds that by this rime Ing was regarded (as in some Anglian genealogies) as a great continental ancestor" (Grigsby 2005:99).
R. North 1997:42f.
Grigsby 2005:99.
Webster, Noah. Letters to a Young Gentleman Commencing His Education. S. Converse, 1823:105.
Grigsby 2005:99.
Walter Goffart (1983), "The Supposedly 'Frankish' Table of Nations: An Edition and Study", Frühmittelalterliche Studien, 17 (1): 98–130, doi:10.1515/9783110242164.98, S2CID 201734002. /wiki/Walter_Goffart