Tulip turkestanica bulbs — Buy online at Farmer Gracy UK
Daffodils Are Delightful, But Tulips Are Better – gardeninacity
World Plants: Plant List
Tiptoe through the tulips – cultural history, molecular phylogenetics and classification of Tulipa (Liliaceae) - Christenhusz - 2013 - Botanical Journal of the Linnean Society - Wiley Online Library
Plants | Free Full-Text | Influence of Temperature on Seed Germination of Five Wild-Growing Tulipa Species of Greece Associated with Their Ecological Profiles: Implications for Conservation and Cultivation