Brush, S. B. (2000). Genes in the field: On-farm conservation of crop diversity. Lewis.
Lua i Stíl Chicago (17ú heag.)Brush, Stephen B. Genes in the Field: On-farm Conservation of Crop Diversity. London: Lewis, 2000.
Lua MLA (9ú heag.)Brush, Stephen B. Genes in the Field: On-farm Conservation of Crop Diversity. Lewis, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.