Book of Liang
Some words from Silla and its predecessor Jinhan are recorded by Chinese historians in chapter 30 of "Wei Zhi" in "Records of the Three Kingdoms" (3rd century) and chapter 54 of the "Book of Liang" (completed in 635). Many of these words appear to be Korean, but a few match Japonic forms, e.g. "mura" (牟羅) 'settlement' vs Old Japanese "mura" 'village'.