Dhillon, G. P. S., and D. S. Sidhu. “Variation for Growth Traits Among 17 Poplar (<I>Populus deltoides< I> Bartr.) Clones Planted in Punjab”. Indian Forester, vol. 136, no. 6, June 2010, pp. 815-20, doi:10.36808/if/2010/v136i6/3782.