Oftedahl, J. S., & Berg, H. B. (2010). Naturbania: The Drammen Model. Topos.
Lua i Stíl Chicago (17ú heag.)Oftedahl, Julie Sjowall, agus Heike Benedicte Berg. "Naturbania: The Drammen Model." Topos 2010.
Lua MLA (8ú heag.)Oftedahl, Julie Sjowall, agus Heike Benedicte Berg. "Naturbania: The Drammen Model." Topos, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.