Umar, H., J. Tukur, H. Ibrahim, and A. Abdurrahman. “Handheld Doppler Versus Pinard Stethoscope for Intrapartum Foetal Monitoring at A Tertiary Centre in Nigeria: A Randomised Controlled Trial”. AJFMED, vol. 1, no. 1, Oct. 2022, pp. 14-19, https://ajfmed.com/index.php/ajfm/article/view/7.