Punthmatharith, Busakorn, and Jananya Mora. 2018. “Effects of Positioning on Respiration Rate, Heart Rate, and Oxygen Saturation in Preterm Infants: A Cross-over Design”. Pacific Rim International Journal of Nursing Research 22 (3):187-99. https://he02.tci-thaijo.org/index.php/PRIJNR/article/view/90626.