Holmberg, Anders; Nikanne, Urpo; Oraviita, Irmeli; Reime, Hannu; Trosterud, Trond (1993). "The structure of INFL and the finite clause in Finnish". Case and other functional categories in Finnish syntax. p. 177. doi:10.1515/9783110902600.177. ISBN978-3-11-013812-2.