CROCKETT, J. U. Perennials: The time-life encyclopedia of gardening. Time-life Books Alexandria.
Lua i Stíl Chicago (17ú heag.)CROCKETT, James Underwood. Perennials: The Time-life Encyclopedia of Gardening. Time-life Books Alexandria.
Lua MLA (8ú heag.)CROCKETT, James Underwood. Perennials: The Time-life Encyclopedia of Gardening. Time-life Books Alexandria.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.