Helentina Mariance Manullang
Faculty of Fisheries, Dharmawangsa University, Jalan. KL. Yos Sudarso No.224, Medan, North Sumatra, 20115, Indonesia
Indonesia

Zulkarnain Lubis
Graduated School of Agricultural Science, Medan Area University, Jalan. Setia Budi No. 79 B/ Jalan Sei Serayu No. 70A Medan, North Sumatra 20121, Indonesia
Indonesia

Raja Sabrina
Faculty of Business and Economics, University of Muhammadiyah Sumatera Utara, Jalan Kapt. Mukhtar Basri No. 3 Medan Sumatera Utara 20238 Indonesia
Indonesia