Damann, K. E. (2019). Drinking water or sewage. Obafemi Awolowo University Press Limited.
Lua i Stíl Chicago (17ú heag.)Damann, Kenneth E. Drinking Water or Sewage. Obafemi Awolowo University Press Limited, 2019.
Lua MLA (9ú heag.)Damann, Kenneth E. Drinking Water or Sewage. Obafemi Awolowo University Press Limited, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.