Tan, H., Wong, K.Y., Kek, H.Y., Lee, K.Q., Kamar, H.M., Ho, W.S., Kang, H.S., Ho, X., Nyakuma, B.B. , Wong, S.L. and Hishammuddin, M.A.H. 2022. Small-scale botanical in enhancing indoor air quality: A bibliometric analysis (2011-2020) and short review. Progress in Energy and Environment. 19, (Aug. 2022), 13–37. DOI:https://doi.org/10.37934/progee.19.1.1337.