Northern Region of Nigeria (Nigeria). Public Works Dept. Annual report on the Public works Department of the Northern Region of Nigeria. Govt. Printer.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Kaduna: Govt. Printer.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Govt. Printer.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.