Git Submodules: Core Concept, Workflows And Tips(blogs.atlassian.com)
blogs.atlassian.com
Git Submodules: Core Concept, Workflows And Tips
http://blogs.atlassian.com/2013/03/git-submodules-workflows-tips/
http://blogs.atlassian.com/2013/03/git-submodules-workflows-tips/
To add to the post, `git submodule foreach` command is invaluable when there are multiple submodules added to one project.