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Lua i Stíl Chicago (17ú heag.)Breimer, Albert. A Monograph on Spanish Palaeozoic Crinoidea. Leiden: E. Ijdo N.V., 1962.
Lua MLA (8ú heag.)Breimer, Albert. A Monograph on Spanish Palaeozoic Crinoidea. E. Ijdo N.V., 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.