N. A. John, R. B. Jasrotia, A. Kanchan, J. John, M. K. Verma, and V. Gangwar, “Impact of Visual Imagery of Coloured Rose Flower on Heart Rate Variability : https://doi.org/10.60787/NMJ-63-3-135”, Niger Med J, vol. 63, no. 3, pp. 213–219, Sep. 2022.