P. L. Lumbanraja, “FAKTOR-FAKTOR PRODUKTIVITAS KELAPA SAWIT RAKYAT DI PROVINSI SUMATERA UTARA MELALUI PENDEKATAN METODE VECTOR ERROR CORRECTION MODEL (VECM) : Factors Of Community Palm Oil Productivity In North Sumatra Province Through The Vector Error Correction Model (VECM) Approach”, J. Analytical Res. Statistic Computation, vol. 3, no. 2, pp. 82–98, Sep. 2024.