อ้างอิง ของ หยาดหิมะ

  1. ↑ Davis, Aaron (1999). The genus Galanthus. Portland, Oregon: Timber Press. pp. 95–96. ISBN 0881924318.
  2. ↑ Bishop, Matt (2002). SNOWDROPS A Monograph of Cultivated Galanthus. Griffin Press. p. 17. ISBN 0954191609. Unknown parameter |month= ignored (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
  3. ↑ Bishop, Davis & Grimshaw (2002) pp17–57
  4. ↑ Bishop, Davis & Grimshaw (2002) p40