International Potash Institute. Agricultural yield potentials in continental climates.
Lua i Stíl Chicago (17ú heag.)International Potash Institute. Agricultural Yield Potentials in Continental Climates.
Lua MLA (8ú heag.)International Potash Institute. Agricultural Yield Potentials in Continental Climates.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.