1. Anonymous (2012) Edible flowers guide.
http://www.thompson-morgan.com/edible-flowers
2. Bown D (1995) Encyclopaedia of herbs and their uses. Dorling Kindersley, London, 424 pp
3. Brummitt RK, Meikle RD (1993) The correct Latin names for the primrose and the oxlip, Primula vulgaris Hudson and P. elatior Hill. Watsonia 19:183
4. Chevallier A (1996) The encyclopedia of medicinal plants. Dorling Kindersley, London, 336 pp
5. Facciola S (1990) Cornucopia. A source book of edible plants. Kampong Publ., Vista, 677 pp