5 個電子郵件營銷人員的客戶忠誠度計劃. Website: https://potterlemming.tumblr.com/post/695868628719075328/%E5%A6%82%E4%BD%95%E9%80%9A%E9%81%8E%E9%9B%BB%E5%AD%90%E9%83%B5%E4%BB%B6%E7%87%9F%E9%8A%B7%E6%8F%90%E9%AB%98%E5%AE%A2%E6%88%B6%E5%BF%A0%E8%AA%A0%E5%BA%A6
