Não informado. (1975). Natural Resources and Development. Bundesanstalt fur Geowissenschaften und Rohstoffe.
Lua i Stíl Chicago (17ú heag.)Não informado. Natural Resources and Development. Hannover, Alemanha: Bundesanstalt fur Geowissenschaften und Rohstoffe, 1975.
Lua MLA (8ú heag.)Não informado. Natural Resources and Development. Bundesanstalt fur Geowissenschaften und Rohstoffe, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.