CROCKETT, J. U. (1979). Lawns And Ground Covers James Underwood Crockett. Time-Life Books.
Lua i Stíl Chicago (17ú heag.)CROCKETT, James Underwood. Lawns And Ground Covers James Underwood Crockett. Time-Life Books, 1979.
Lua MLA (8ú heag.)CROCKETT, James Underwood. Lawns And Ground Covers James Underwood Crockett. Time-Life Books, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.