Ulina, Sri, Satia Negara Lubis, & Matius Bangun.
" INCOME STRUCTURE ANALYSIS OF VANNAMEI (Litopenaeus vannamei)SHRIMP FARMING IN SUB-DISTRICT OF SECANGGANG, DISTRICT OF LANGKAT." <em>JURNAL PROINTEGRITA</em> [Online], 3.3 (2019): 473-480. Web.  4 May. 2024