Karnik, M. G., Kuldip Bhatia, and Jia Lal. “Seasonal Variation in Pine Needle Oil from <I>Pinus roxburghii< I>”;. Indian Forester 92, no. 8 (August 1, 1966): 521–522. Accessed December 26, 2025. https://indianforester.co.in/index.php/indianforester/article/view/25382.