Jack, D. T. (1958). Economic survey of Sierra Leone. Govt. Printing Office.
Lua i Stíl Chicago (17ú heag.)Jack, D. T. Economic Survey of Sierra Leone. [Freetown]: Govt. Printing Office, 1958.
Lua MLA (8ú heag.)Jack, D. T. Economic Survey of Sierra Leone. Govt. Printing Office, 1958.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.