Nutthapornnitchakul, Surapa, et al. “Effect of Drought Stress on Proline Gene Expression, Enzyme Activity, and Physiological Responses in Thai Mulberry (Morus spp.)”. HAYATI Journal of Biosciences, vol. 31, no. 3, Feb. 2024, pp. 559-71, https://doi.org/10.4308/hjb.31.3.559-571.