W. Hanifah, V. and Wasito 2021. Perception on Integration of Food Crops and Livestock in Oil Palm Plantation to Reach Bioindustrial Agriculture Model: Case in North Sumatra Provinsi, Indonesia. Journal of Science, Technology and Innovation Policy. 4, 2 (Jun. 2021), 1–10. DOI:https://doi.org/10.11113/jostip.v4n2.32.