Cross reference
Judges 1:11
11 And from thence he went against the inhabitants of Debir. (Now the name of Debir beforetime was Kiriath-sepher.)
Joshua 15:15
15 And he went up thence against the inhabitants of Debir: now the name of Debir beforetime was Kiriath-sepher.
Joshua 10:38-39
38 And Joshua returned, and all Israel with him, to Debir, and fought against it:
39 and he took it, and the king thereof, and all the cities thereof; and they smote them with the edge of the sword, and utterly destroyed all the souls that were therein; he left none remaining: as he had done to Hebron, so he did to Debir, and to the king thereof; as he had done also to Libnah, and to the king thereof.