Wareing, P. F., & Cooper, J. P. (1971). Potential crop production: A case study. Heinemann Educational Books.
Lua i Stíl Chicago (17ú heag.)Wareing, P. F., agus J. P. Cooper. Potential Crop Production: A Case Study. London: Heinemann Educational Books, 1971.
Lua MLA (9ú heag.)Wareing, P. F., agus J. P. Cooper. Potential Crop Production: A Case Study. Heinemann Educational Books, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.