Donaldson, H. (1965). Coal. Published for the Nuffield Foundation by the Longmans/ Penguin Books.
Lua i Stíl Chicago (17ú heag.)Donaldson, H. Coal. London: Published for the Nuffield Foundation by the Longmans/ Penguin Books, 1965.
Lua MLA (9ú heag.)Donaldson, H. Coal. Published for the Nuffield Foundation by the Longmans/ Penguin Books, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.