Παραπομπή σε μορφή APA (7η εκδ.)

Norman, D. W. (1973). Economic analysis of agricultural production and labour utilisation among the Hausa in the North of Nigeria. Dept. of Agricultural Economics.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Norman, D. W. Economic Analysis of Agricultural Production and Labour Utilisation Among the Hausa in the North of Nigeria. [East Lansing: Dept. of Agricultural Economics, 1973.

Παραπομπή σε μορφή MLA (9th εκδ.)

Norman, D. W. Economic Analysis of Agricultural Production and Labour Utilisation Among the Hausa in the North of Nigeria. Dept. of Agricultural Economics, 1973.