Markey, T. L. (1981). Frisian. Mouton Publishers.
Lua i Stíl Chicago (17ú heag.)Markey, Thomas L. Frisian. The Hague ; New York: Mouton Publishers, 1981.
Lua MLA (9ú heag.)Markey, Thomas L. Frisian. Mouton Publishers, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.