@article{
  author = {najafi zadeh, nadereh sadat, tabzar, afsaneh},
  title = {Influence of relationship marketing investment on customer's gratitude and loyalty in retailers (Case Study: Hakopian Chain Store Customers)},
  journal = {Jounal of Marketing Management},
  year = {2018},
  volume = {13},
  number = {4},
  pages = {21-32},
  doi = {}
}