Chandra, J. P. “Studies on Air-Layering on Blue Pine (<I>Pinus wallichiana< I> A.B.Jackson)”. Indian Forester 100, no. 11 (November 1, 1974): 681–683. Accessed December 4, 2025. http://indianforester.co.in/index.php/indianforester/article/view/26909.