Hidayat, S. et al. 2021. Potensi Pengembangan Komoditas Unggulan Tanaman Pangan Berdasarkan Analisis Location Quotient (LQ) di Kabupaten Langkat. Proceedings Series on Physical & Formal Sciences. 2, (Nov. 2021), 356–361. DOI:https://doi.org/10.30595/pspfs.v2i.211.