↑ Heiss, Mary Lou; Heiss, Robert J. (2012-01-18). The Tea Enthusiast's Handbook: A Guide to the World's Best Teas . Random House. ISBN978-1-60774-378-1。
↑ Roy, Awadh Kishore; Dogra, JVV; Varma, Satyendra Kumar (1998). Phytodiversification and Human Welfare: Dedicated to Late Prof. KS Bilgrami, FNA (1933-96) . MD Publications Pvt. Ltd. ISBN978-81-7533-077-1。
↑ Heiss, Mary Lou; Heiss, Robert J. (2011-03-23). The Story of Tea: A Cultural History and Drinking Guide . Random House. ISBN978-1-60774-172-5。