• “Animals Of The Kalahari Desert”. WorldAtlas, 21 Oct. 2020, https://www.worldatlas.com/articles/animals-of-the-kalahari-desert.html.
• Coimbra, Raphael T. F., et al. “Whole-Genome Analysis of Giraffe Supports Four Distinct Species”. Current Biology, vol. 31, no. 13, July 2021, pp. 2929-2938.e5. www.cell.com, https://doi.org/10.1016/j.cub.2021.04.033.
• FAO, GSBI, et al. State of Knowledge of Soil Biodiversity - Status, Challenges and Potentialities: Report 2020. Food and Agriculture Organization of the United Nations (FAO), 2020, p. 618. ISBN: 978-92-5-133582-6, https://www.fao.org/documents/card/en/c/cb1928en.
• “History of Rice Cultivation”. Ricepedia, https://ricepedia.org/culture/history-of-rice-cultivation. Accessed 31 Dec. 2021.
• Sender, Ron, et al. “Revised Estimates for the Number of Human and Bacteria Cells in the Body”. PLOS Biology, vol. 14, no. 8, Aug. 2016, p. e1002533. DOI.org (Crossref), https://doi.org/10.1371/journal.pbio.1002533.
• UN Environment. “Biodiversity - Factsheet”. UNEP - UN Environment Programme, 10 Aug. 2017, http://www.unep.org/resources/factsheet/biodiversity-factsheet.