Jubilees 4:10
9 Cain married his sister Awan, and at the end of the fourth jubilee [148-96] she gave birth to Enoch for him. In the first year of the first week of the fifth jubilee [197] houses were built on the earth. Then Cain built a city and named it after his son Enoch. 10 Adam knew his wife Eve, and she gave birth to nine more children. 11 In the fifth week of the fifth jubilee [225-31] Seth married his sister Azura, and in its fourth year [228] she gave birth to Enosh for him.
Pseudo Philo Biblical Antiquities 1:2
1 The beginning of the world. Adam begat three sons and one daughter, Cain, Noaba, Abel and Seth. 2 And Adam lived after he begat Seth 700 years, and begat 12 sons and 8 daughters. 3 And these are the names of the males: Eliseel, Suris, Elamiel, Brabal, Naat, Zarama, Zasam, Maathal, and Anath. 4 And these are his daughters: Phua, Iectas, Arebica, Sifa, Tecia, Saba, Asin.
Notes and References
"... Jubilees 4:10 ... Eve subsequently gave birth to nine more children: This is not mentioned in Genesis, but Adam and Eve’s additional children do figure elsewhere in Second Temple writings: according to Pseudo-Philo’s Biblical Antiquities 1:2, they had “twelve sons and eight daughters” after the birth of Seth ..."
Kugel, James L. A Walk through Jubilees: Studies in the Book of Jubilees and the World of Its Creation (p. 46) Brill, 2012