Ulina, Sri, 		Lubis, Satia, AND 		Bangun, Matius.
" INCOME STRUCTURE ANALYSIS OF VANNAMEI (Litopenaeus vannamei)SHRIMP FARMING IN SUB-DISTRICT OF SECANGGANG, DISTRICT OF LANGKAT" <em>JURNAL PROINTEGRITA</em> [Online], Volume 3 Number 3 (6 January 2020)