Harahap, Huntari, et al. “Secondhand Smoke, PEFR, And Pregnancy In The Second And Third Trimesters”. Jambi Medical Journal : Jurnal Kedokteran Dan Kesehatan, vol. 13, no. 2, Nov. 2025, pp. 286-92, doi:10.22437/jmj.v13i2.48959.