Parker, R. Plant and soil science: Fundamentals and applications.
Lua i Stíl Chicago (17ú heag.)Parker, Rick. Plant and Soil Science: Fundamentals and Applications.
Lua MLA (8ú heag.)Parker, Rick. Plant and Soil Science: Fundamentals and Applications.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.