O. C. Molua, A. O. Ukpene, J. C. Igborgbor, C. P. Ukpene, and J. U. Emagbetere, “The Influence of Indoor Air Quality on Hospitality Management: Examining Biological, Physical and Economic Factors”, JSRTH, vol. 3, no. 05, pp. 39–51, Sep. 2023.