Zakka, Solomon Dyachia, Ariva Sugandi Permana, Mohammad Rafee Majid, Amos Danladi, and Parah Emmanuel Bako. 2017. “Urban Greenery a Pathway to Environmental Sustainability in Sub Saharan Africa: A Case of Northern Nigeria Cities”. International Journal of Built Environment and Sustainability 4 (3). https://doi.org/10.11113/ijbes.v4.n3.211.