Marjan Mollaalia. “THE EFFECT OF DIGITAL ADVERTISING N TWORK FOR TOURISM USING LAVIJ AND STEINER MODEL IN QAZVIN”. Singaporean Journal of Business Economics and Management, vol. 4, no. (6), June 2015, pp. 1-9, https://www.singaporeanjbem.com/index.php/SJBEM/article/view/428.