Book of Jubilees 4:9
And Cain took Âwân his sister to be his wife and she bare him Enoch at the close of the fourth jubilee. [190-196 A.M.] And in the first year of the first week of the fifth jubilee, [197 A.M.] houses were built on the earth, and Cain built a city, and called its name after the name of his son Enoch.
Background and history of Book of Jubilees, and issues with this book.
R. H. Charles, The Book of Jubilees, in The Apocrypha and Pseudepigrapha of the Old Testament, vol. 2 (Oxford: Clarendon Press, 1913). Public domain in the United States (published 1913). Charles died in 1931, so the book is in the public domain in the United Kingdom. The verse text is the Joshua Williams transcription at pseudepigrapha.com. Jubilees 1:8 and 1:9 are divided at the break in the 1902 Clarendon scan (archive.org bookofjubileesor00char), where verse 9 begins “For they will forget.” That scan also numbers the angel-of-the-presence sentence as 1:29. Editorial brackets in the translation are Charles’s.