Mitchell, P. M. (1978). Vilhelm Gronbech. Twayne.
Lua i Stíl Chicago (17ú heag.)Mitchell, Phillip Marshall. Vilhelm Gronbech. Twayne, 1978.
Lua MLA (9ú heag.)Mitchell, Phillip Marshall. Vilhelm Gronbech. Twayne, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.