Παραπομπή σε μορφή APA (7η εκδ.)

Northern Region of Nigeria (Nigeria). Public Works Dept. Annual report on the Public works Department of the Northern Region of Nigeria. Govt. Printer.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Kaduna: Govt. Printer.

Παραπομπή σε μορφή MLA (8th εκδ.)

Northern Region of Nigeria (Nigeria). Public Works Dept. Annual Report on the Public Works Department of the Northern Region of Nigeria. Govt. Printer.