Meyer, Ulla (1943). «Martha Ostenso». Norske kvinner. Jacob Dybwads forlag. s. 147.
Skille, Nan Bentsen (1981). «Vikingenes datter, valkyrienes mor : En presentasjon av forfatteren Martha Ostenso (1900-1963)». Sirene. 1981 Nr. 1. Oslo. s. 34–37.
Sverre Tusvik, red. (1994). Bestseljarar. Noregs forskingsråd. ISBN8212002314. I den sammenstilte tabellen på side 139 er Graagaas oppført med 14 000 eksemplarer, 1 000 eksemplarer lavere enn i årsoppgaven for 1933.
Peter E. Rider (1974). «The Magpie A Novel of Post-War Disillusionment 1923 · Heritage. Introduction.». OverDrive. University of Toronto Press. Besøkt 23. april 2020. «Alhough Durkin taught extention classes at Columbia, the pair lacked a sufficient source of income. They did, however, have compatible talents. Flamboyant, vibrant, and imaginative, Martha had a creative literary ability wich was to become the source of many fine novels. Douglas, on the other hand, hade the technical skills and experience to give her ideas shape and strength. She had brought with her an outline of a novel, and they immediately set to work to complete it. (...) The product of their efforts, Wild Geese, received immediate acclaim. Not so Douglas Durkin. Since he had already published, the novel was entered under Martha Osteno's name alone. (...) The proportion that each contributed to the novels is hard do distiguish, but both their talents were undobutedly an integral part of the final products.»
Social Networks and Archival Context, SNAC Ark-ID w6p27gvc, besøkt 9. oktober 2017[Hentet fra Wikidata]
stolaf.edu
naha.stolaf.edu
Joan N. Buckley (1979). «Martha Ostenso: Norwegian-American Immigrant Novelist». Norwegian-American Studies. 28. NAHA. s. 69-81. Arkivert fra originalenBruk av |arkiv_url= krever at |arkivdato= også er angitt (hjelp).
Joan N. Buckley (1979). «Martha Ostenso: Norwegian-American Immigrant Novelist». Norwegian-American Studies. 28. NAHA. s. 69-81. Arkivert fra originalenBruk av |arkiv_url= krever at |arkivdato= også er angitt (hjelp).
