Ochse. (1961). Tropical and Subtropical Agriculture. MC.
Lua i Stíl Chicago (17ú heag.)Ochse. Tropical and Subtropical Agriculture. MC, 1961.
Lua MLA (8ú heag.)Ochse. Tropical and Subtropical Agriculture. MC, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.