THE SUSTANABLE MARKETING IMMUNITY OF TOURIST OF BUSINESS IN LIGHT OF THE PANDEMIC-CORONA (COVID-19) AN APPLIED RESEARCH IN TRAVEL AND TOURISM COMPANIES IN BAGHDAD: THE SUSTANABLE MARKETING IMMUNITY OF TOURIST OF BUSINESS IN LIGHT OF THE PANDEMIC-CORONA (COVID-19) AN APPLIED RESEARCH IN TRAVEL AND TOURISM COMPANIES IN BAGHDAD. IJMRCP [Internet]. 2021 Dec. 31 [cited 2024 May 3];13(2):173-91. Available from: https://jmracpc.uobaghdad.edu.iq/index.php/IJMRCP/article/view/261