Jelaskan Rujukan dari Sigrid Undset dalam bahasa melayu

Inside the gate: Sigrid Undset's Life at Bjerkebæk by Nan Bentzen Skille, translated by Tiina Nunnally.

Bayerschmidt, Carl F. 1970. Sigrid Undset. (Twayne's world authors series 107.) New York: Twayne Publishers.

Nan Bentzen Skille: 2018 Inside the Gate. Sigrid Undset's Life at Bjerkebæk - biography translated by Tiina Nunnally University of Minnesota Press,