Haryanto, Sonny, Umi Mardiyati, and Agung Dharmawan Buchdadi. 2018. “Analyzing Abnormal Return Before And After The Announcement Of Merger And Acquisition In 2018”. Journal of Business and Behavioural Entrepreneurship 2 (1), 9-17. https://doi.org/10.21009/JOBBE.002.1.02.