Hariadi, W. “Analisis Intervesi Fungsi Step Efek Program Tol-Laut Terhadap Pergerakan Harga Saham TMAS.JK”. UJMC (Unisda Journal of Mathematics and Computer Science), Vol. 5, no. 01, June 2019, pp. 47 -54, doi:https://doi.org/10.52166/ujmc.v5i01.1484.