Ramfjord, S. P., & Ash, M. M. (1966). Occlusion. Saunders.
Lua i Stíl Chicago (17ú heag.)Ramfjord, Sigurd Peder, agus Major M. Ash. Occlusion. Philadelphia: Saunders, 1966.
Lua MLA (9ú heag.)Ramfjord, Sigurd Peder, agus Major M. Ash. Occlusion. Saunders, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.