versi inggris Official Ruby Docs http://ruby-doc.com/docs/ProgrammingRuby/ RubyGems (package manager ruby) docs https://guides.rubygems.org/ https://guides.rubygems.org/make-your-own-gem/ https://www.digitalocean.com/community/tutorials/how-to-work-with-the-ruby-package-manager-rubygems-getting-started Tutorial ruby https://pine.fm/LearnToProgram/ Tutorial Rakefile https://ruby.github.io/rake/doc/rakefile_rdoc.html