(1990). Soil Biology Guide. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Soil Biology Guide. John Wiley & Sons, 1990.
Lua MLA (8ú heag.)Soil Biology Guide. John Wiley & Sons, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.