Nwachukwu, J. (2018). Organic Matter: The Source of Our Wealth. Obafemi Awolowo University Press Limited.
Lua i Stíl Chicago (17ú heag.)Nwachukwu, J.I. Organic Matter: The Source of Our Wealth. Obafemi Awolowo University Press Limited, 2018.
Lua MLA (9ú heag.)Nwachukwu, J.I. Organic Matter: The Source of Our Wealth. Obafemi Awolowo University Press Limited, 2018.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.