Butler, J. (1981). The economics of historic country houses. Policy Studies Institute.
Lua i Stíl Chicago (17ú heag.)Butler, John. The Economics of Historic Country Houses. London: Policy Studies Institute, 1981.
Lua MLA (8ú heag.)Butler, John. The Economics of Historic Country Houses. Policy Studies Institute, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.