ProQuestEbook: https://ebookcentral.proquest.com/lib/uchittagong/home.actionProQuest: https://www.proquest.com/shibboleth?accountid=204258 IEEE Xplorehttps://ieeexplore.ieee.org/servlet/wayf.jsp?entityId=https://idp.cu.ac.bd/idp/shibboleth&url=https%3A%2F%2Fieeexplore.ieee.org%2FXplore%2Fhome.jsp Emeraldhttps://www.emerald.com/start-session?idp=https://idp.cu.ac.bd/idp/shibboleth