1,721 Nurul Nadia Binti Ya'akob 2019-02-21 http://www.worldagroforestry.org/treedb/AFTPDFS/Populus_deltoides.PDF Orwa, C., Mutua, A., Kindt, R., Jamnadass, R., Anthony, S. (2009). Agroforestree Database:a tree reference and selection guide version 4.0. Retrieved from http://www.worldagroforestry.org/sites/treedbs/treedatabases.asp Revised record 30.9.2019.