@incollection{, 45173E8C1BF6480884C965EC70889039 , author={{MdMoniruzzaman} and {World University of Bangladesh}}, journal={{Global Journal of Management and Business Research}}, journal={{GJMBR}}2249-45880975-585310.34257/GJMBR, address={Cambridge, United States}, publisher={Global Journals Organisation}1511119 } @book{b0, , author={{ KGArmstrong }} , title={{Principles of Marketing}} India , publisher={Pearson Publications} , year={2008} , note={12th ed.} } @book{b1, , author={{ RPBagavathi }} , title={{Modern Marketing Principal And Practices}} , year={1987} , note={India: S Chanda & Company Ltd} } @book{b2, , author={{ CKothari }} , title={{Research Methodology Methods & Technique}} , year={1985} , note={India: New Age International (P) Ltd} } @book{b3, , author={{ PKotler }} , title={{Marketing Management}} , year={2002} , note={10th ed.} } @incollection{b4, , title={{United States of America}} , author={{ CLovelock } and { WJ }} , booktitle={{Service Marketing}} Westford,PEARSON , publisher={Courier} , year={2010-2011} , note={6th ed.} } @book{b5, , title={{}} , author={{ PrenticeHall }} } @book{b6, , author={{ NMalhotra }} , title={{Marketing Research}} New Delhi , publisher={Prentice Hall} , year={2003} , note={3rd ed.} } @book{b7, , title={{Principal of Marketing}} , author={{ APalmer }} , year={2000} , publisher={Oxford University Press} , address={Oxford} } @incollection{b8, , title={{Marketing Management}} , booktitle={{Pumps & Systems available at: S.Namakumari}} India , publisher={Macmillan India Limited} , year={1990} , note={2nd ed.} } @incollection{b9, , title={{The PVC Hand pump: International Development Research Centre}} , journal={{Idrc.ca. Retrieved}} , year={2010-11-01} }