Harahap, H. et al. 2025. Secondhand Smoke, PEFR, And Pregnancy In The Second And Third Trimesters. Jambi Medical Journal : Jurnal Kedokteran dan Kesehatan. 13, 2 (Nov. 2025), 286–292. DOI:https://doi.org/10.22437/jmj.v13i2.48959.