SIHOMBING, N., & 		SIHOMBING, A.
(2019).
 The Effect of Business Environment and Innovation Spirit on Competitive Advantages and Implications on Marketing Performance of Ulos Weaving in North Sumatra.
<em>Journal Of Environmental Management And Tourism, 9</em>(8), 1782-1788.
doi:10.14505//jemt.v9.8(32).18