Ward, P., & Kennedy, W. (1993). Maastrichtian ammonites from the Biscay region (France, Spain).
Lua i Stíl Chicago (17ú heag.)Ward, P., agus W. Kennedy. Maastrichtian Ammonites from the Biscay Region (France, Spain). 1993.
Lua MLA (9ú heag.)Ward, P., agus W. Kennedy. Maastrichtian Ammonites from the Biscay Region (France, Spain). 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.