1. Stanford PK. August weismann’s theory of the germ-plasm and the problem of unconceived alternatives. Hist Philos Life Sci. 2005;27(2):163–99.
2. Huang HP, Li JC, Huang LQ, et al. The application of biotechnology in medicinal plants breeding research in china. Chin J Integr Med. 2015;21(7):551–60.
3. Rushforth, K. (1999). Trees of Britain and Europe. Collins ISBN 0-00-220013-9.
4. USA National Council (2015) Managing global genetic resources: agricultural crop issues and policies.
5. Schippmann U, Cunningham AB, Leaman DJ (2002) Impact of cultivation and gathering of medicinal plants on biodiversity: global trends and issues (Case Study No. 7). In Biodiversity and the ecosystem approach in agriculture, forestry and fisheries, satellite event session on the occasion of the 9th regular session of the commission on “Genetic Resources for Food and Agriculture”, Rome, 12–13 October, 2002. FAO Document Repository of United Nations.