Nahok, B., Tumpeesuwan, S. and Tumpeesuwan, C. 2021. Five new species of the land snail genus Landouria Godwin-Austen, 1918 (Gastropoda, Camaenidae) from northeastern Thailand, with note on genitalia and radula morphology of Landouria diplogramma (Möllendorff, 1902). European Journal of Taxonomy. 767, 1 (Sep. 2021), 142–166. DOI:https://doi.org/10.5852/ejt.2021.767.1495.