Garbutt, D. (1967). Planning for profits. Gee & Co..
Lua i Stíl Chicago (17ú heag.)Garbutt, Douglas. Planning for Profits. London: Gee & Co., 1967.
Lua MLA (8ú heag.)Garbutt, Douglas. Planning for Profits. Gee & Co., 1967.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.