Sidhu, S. P., and Jastesh Kaur Grewal. "Silk Dyed with Goldendrop (Onosma echioides) Dye." Colourage 55/3 (2008): 51.

Sidhu, S. P., and Jastesh Kaur Grewal. "Silk Dyed with Goldendrop (Onosma echioides) Dye." Colourage 55/3 (2008): 51.