Sitompul, D.P., Salqaura, S.A., Rini, E.S. and Sembiring, B.K.F. 2021. Implementation of entrepreneurial marketing in improving sustainability performance of SME in pandemic age: case study on start up in Medan. International journal of business, economics & management. 4, 2 (Jun. 2021), 301-309. DOI:https://doi.org/10.31295/ijbem.v4n2.1643.