1. Amazon S3 Pricing Policy. http://aws.amazon.com/s3/#pricing (2014)
2. Bandwidth Costs for Cloud Storage. http://blog.dshr.org/2012/11/bandwidth-costs-for-cloud-storage.html
3. Bandwidth Limitations Are a Concern with Cloud Backup. http://searchdatabackup.techtarget.com/video/Bandwidth-limitations-are-a-concern-with-cloud-backup
4. Cisco Global Cloud Index: Forecast and Methodology, 2012-2017. Trend 3: Remote Data Services and Storage Access Services Growth. http://www.cisco.com/en/US/solutions/collateral/ns341/ns525/ns537/ns705/ns1175/Cloud_Index_White_Paper.html
5. Dirty Secrets: 5 Weaknesses of Cloud Storage Gateways. http://www.nasuni.com/blog/28-dirty_secrets_5_weaknesses_of_cloud_storage