Niha, Chakriya, Sompong Te-chato, และ Sureerat Yenchon. 2021. “Factors affecting haustorium embryo and secondary somatic embryo induction of oil palm (Elaeis quineensis Jacq.) ‘SUP-PSU1’”. วารสารแก่นเกษตร 50 (1):289-300. https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/248081.