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This is to certify that your paper entitled «The Impact of Contextualized Texts on ESP Learners Vocabulary Retention (A Case Study of ESP Course for Mechanical Engineering Students)» was indexed with 13 pages, in the CIVILICA citation database, code COI:ELSCONF06_105, after evaluation and approval of the referees of the "The sixth International Conference on Applied Research in Language Studies held in Tehran 2019.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above conference and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.