Owen, G. H. (1974). Agriculltural science. Longman.
Lua i Stíl Chicago (17ú heag.)Owen, G. H. Agriculltural Science. London: Longman, 1974.
Lua MLA (9ú heag.)Owen, G. H. Agriculltural Science. Longman, 1974.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.