Laisupasin, P., S. Tunskul, R. Langrugsa, and P. Visetvuth. “Serum PSA in the Diagnosis of Prostate Cancer in Thai men : A Preliminary Report”. Journal of Associated Medical Sciences, vol. 38, no. 1, Feb. 2015, p. 2, https://he01.tci-thaijo.org/index.php/bulletinAMS/article/view/60190.