Phromsuthirak, P. “Ultrastructural Observations on the Leucocytes of Ophicephalus striatus Bloch and Clarias batrachus Linnaeus”. Agriculture and Natural Resources, vol. 20, no. 3, Sept. 1986, pp. 318-32, https://li01.tci-thaijo.org/index.php/anres/article/view/242675.