Birks, J. S. (1978). Human capital on the Nile: Development and emigration in the Arab Republic of Egypt and the Democratic Republic of Sudan. International Labour Office.
Lua i Stíl Chicago (17ú heag.)Birks, J. S. Human Capital on the Nile: Development and Emigration in the Arab Republic of Egypt and the Democratic Republic of Sudan. Geneva [Switzerland]: International Labour Office, 1978.
Lua MLA (9ú heag.)Birks, J. S. Human Capital on the Nile: Development and Emigration in the Arab Republic of Egypt and the Democratic Republic of Sudan. International Labour Office, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.