Wen-Jing Liu, Yong-Zhu Cui, Lei Zhang and Sen-Fang Ren. (2009). Study on Extracting Natural Plant Dyestuff by Enzyme-ultrasonic Method and its Dyeing Ability. Journal of Fiber Bioengineering and Informatics. 2 (1). 25-30. doi:10.3993/jfbi06200904