Rana, Sumita, and Jyotsna Rastogi. “Occurrence and Floral Details of Four New Invasive Alien Species in Uttarakhand, India”. Archives of Agriculture and Environmental Science, vol. 2, no. 2, June 2017, pp. 113-8, https://aesacademy.org/journals/index.php/aaes/article/view/02-02-010.