Batubara, N. S., R. A. Batubara, and R. A. Siregar. “Factors Influencing Fertile Age Couples in the Use of Long-Term Contraceptive Methods (MKJP)”. International Journal of Public Health Excellence (IJPHE), vol. 4, no. 2, Jan. 2025, pp. 396-02, doi:10.55299/ijphe.v4i2.1261.