Butt, A. A. (1966). Late oligocene foraminifera from Escornebeou, SW France. Schotanus & Jens.
Lua i Stíl Chicago (17ú heag.)Butt, Aftab Ahmad. Late Oligocene Foraminifera from Escornebeou, SW France. Utrecht: Schotanus & Jens, 1966.
Lua MLA (8ú heag.)Butt, Aftab Ahmad. Late Oligocene Foraminifera from Escornebeou, SW France. Schotanus & Jens, 1966.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.