Não informado. (1961). Netherlands Journal of Sea Research. Netherlands Institute for Sea Research.
Lua i Stíl Chicago (17ú heag.)Não informado. Netherlands Journal of Sea Research. Texel, Holanda: Netherlands Institute for Sea Research, 1961.
Lua MLA (8ú heag.)Não informado. Netherlands Journal of Sea Research. Netherlands Institute for Sea Research, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.