Zhao, Yongliang, Weihua Ruan, Yonghong Jiang, and Junnan Rao. “Salesperson Human Capital Investment and Heterogeneous Export Enterprises Performance”. Journal of Business Economics and Management 19, no. 4 (December 11, 2018): 609-629. Accessed December 4, 2024. https://jcem.vgtu.lt/index.php/JBEM/article/view/6267.