Tham khảo Păng-xê

  1. ↑ “Viola × wittrockiana”. Germplasm Resources Information Network (GRIN) (Agricultural Research Service (ARS), United States Department of Agriculture (USDA)). 
  2. ↑ Yockteng, Jr, R.; Ballard, H.E.; Mansion, G.; Dajoz, I. & Nadot, S. (2003). “Relationships among pansies (Viola section Melanium) investigated using ITS and ISSR markers”. Plant Systematics and Evolution 241 (3–4): 153–170. doi:10.1007/s00606-003-0045-7. 
  3. ↑ McGlashan, James. The Dublin University Magazine: A Literary and Political Journal. Vol. 42. July to December 1853: 286.
  4. ↑ Botanical info on Viola tricolor in Sweden (tiếng Thụy Điển)
  5. ↑ Silverthorne, Elizabeth. Legends and Lore of Texas Wildflowers. Texas A&M University Press, 2003.
  6. ↑ Dix, Dorothea Lynde. The garland of flora. S. G. Goodrich and co. and Carter and Hendee, 1829.
  7. ↑ Diderot, Denis (ngày 15 tháng 4 năm 2013). “Viola, pansy”. Encyclopedia of Diderot & d'Alembert - Collaborative Translation Project. Truy cập ngày 1 tháng 4 năm 2015. 

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