Walls, J. G. (1975). Cowries (Second edition.). T.F.H. Publications.
Lua i Stíl Chicago (17ú heag.)Walls, Jerry G. Cowries. Second edition. Neptune, New Jersey: T.F.H. Publications, 1975.
Lua MLA (9ú heag.)Walls, Jerry G. Cowries. Second edition. T.F.H. Publications, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.