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 * [Dmitriy Samovskiy](http://www.somic.org/2016/04/12/rise-of-new-operations/) - (2016) The Rise of New Operations
 * [Stack Exchange](https://devops.stackexchange.com/questions/98/how-to-test-provisioning-and-configuration-in-ansible-setup) - (2017) How to test provisioning and configuration in Ansible setup? Solutions : Goss, Testinfra, Serverspec, Inspec
 * [/r/devops](https://www.reddit.com/r/devops/comments/629dj3/jenkinsansible_vs_jenkinsansibleansible_tower/) - Jenkins+Ansible vs Jenkins+Ansible+Ansible Tower
+* [Ansible Docs](http://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html#variable-precedence-where-should-i-put-a-variable) - Ansible variable precedence rules
 
 ### Ansible Vault
 * [brianshumate/ansible-vault](https://github.com/brianshumate/ansible-vault) - Ansible role for Vault