Asperula im Germplasm Resources Information Network (GRIN), USDA, ARS, National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland.
bgbm.org
Panayiotis Trigas, Gregoris Iatrou: The local endemic flora of Evvia (W Aegean, Greece). In: Willdenowia. Band36, 2006, ISSN0511-9618, S.259, doi:10.3372/wi.36.36121 (bgbm.org [PDF; 2kB]).
doi.org
Salih Gücel, Özcan Seçmen: Conservation biology of Asperula daphneola (Rubiaceae) in Western Turkey. In: Turkish Journal of Botany, Band 33, 2009, S. 257–262. doi:10.3906/bot-0806-7PDF.
Panayiotis Trigas, Gregoris Iatrou: The local endemic flora of Evvia (W Aegean, Greece). In: Willdenowia. Band36, 2006, ISSN0511-9618, S.259, doi:10.3372/wi.36.36121 (bgbm.org [PDF; 2kB]).
efloras.org
Tao Chen, Friedrich Ehrendorfer: Asperula. In: Wu Zheng-yi, Peter H. Raven, Deyuan Hong (Hrsg.): Flora of China. Volume 19: Cucurbitaceae through Valerianaceae, with Annonaceae and Berberidaceae. Science Press / Missouri Botanical Garden Press, Beijing / St. Louis 2011, ISBN 978-1-935641-04-9, S.77 (englisch, [1]).
kew.org
powo.science.kew.org
Rafaël Govaerts, 2003: World Checklist of Selected Plant Families Database in ACCESS: 1-216203. The Board of Trustees of the Royal Botanic Gardens, Kew. Asperula. In: POWO = Plants of the World Online von Board of Trustees of the Royal Botanic Gardens, Kew: Kew Science, abgerufen am 4. Juni 2020..
Asperula bei Tropicos.org. Missouri Botanical Garden, St. Louis
tubitak.gov.tr
journals.tubitak.gov.tr
Salih Gücel, Özcan Seçmen: Conservation biology of Asperula daphneola (Rubiaceae) in Western Turkey. In: Turkish Journal of Botany, Band 33, 2009, S. 257–262. doi:10.3906/bot-0806-7PDF.
washington.edu
depts.washington.edu
Valerie L. Soza, Richard G. Olmstead: Molecular systematics of tribe Rubieae (Rubiaceae): Evolution of major clades, development of leaf-like whorls, and biogeography. In: Taxon. Band59, Nr.3, 2010, S.755–771 (washington.edu [PDF]).
zdb-katalog.de
Panayiotis Trigas, Gregoris Iatrou: The local endemic flora of Evvia (W Aegean, Greece). In: Willdenowia. Band36, 2006, ISSN0511-9618, S.259, doi:10.3372/wi.36.36121 (bgbm.org [PDF; 2kB]).