2 Nur Marahaini Mohd Nizar 2019-08-22 https://www.iapt-taxon.org/nomen/pages/main/art_4.html Webpage APA citation: International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code). CHAPTER I - TAXA AND THEIR RANKS ARTICLE 4 Retrieved from https://www.iapt-taxon.org/nomen/pages/main/art_4.html Citation provided: Turland, N. J., Wiersema, J. H., Barrie, F. R., Greuter, W., Hawksworth, D. L., Herendeen, P. S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T. W., McNeill, J., Monro, A. M., Prado, J., Price, M. J. & Smith, G. F. (eds.) 2018: International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017. Regnum Vegetabile 159. Glashütten: Koeltz Botanical Books. DOI https://doi.org/10.12705/Code.2018