GU, Y. (2002). Introduction. Asian Journal of English Language Teaching, 12(), 1-4. https://www.airitilibrary.com/Article/Detail?DocID=P20180321001-200212-201803260023-201803260023-1-4
Kato, H. (1994). Introduction. Diagnostic and Therapeutic Endoscopy, 1994(), vii-vii. https://doi.org/10.1155/DTE.1.vii