Northern Region of Nigeria (Nigeria). Public Works Dept. Annual report on the Public works Department of the Northern Region of Nigeria. Govt. Printer.
Lua i Stíl Chicago (17ú heag.)Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Kaduna: Govt. Printer.
Lua MLA (8ú heag.)Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Govt. Printer.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.