คนเพียร สมพล, Natnicha Jumpadang Jumpadang, Arada Viwatdecha, Peerada Kanokwalai, Khanabhoj Tangpulpolwanit, Kotchaklao Mahasean, Pitchapon Kraichoo, Waritrada Woradechananthakul, and Sayamon Sithtisarn. 2026. “Phytochemical Analysis, Antioxidant Activities, and Antibacterial Potential of Piper retrofractum Vahl Leaf Extract”. Koch Cha Sarn Journal of Science 48 (1):22-28. https://li01.tci-thaijo.org/index.php/kochasarn/article/view/270731.