- http://ellislab.com/forums/viewthread/234635/#1051458
- http://ellislab.com/forums/viewthread/194854/#917798
- http://ellislab.com/forums/viewthread/91422/
- http://ellislab.com/forums/viewthread/110130/
- http://darrenonthe.net/2011/05/08/upload-multiple-files-with-codeigniter/
- http://porquero.blogspot.com/2012/05/codeigniter-multifilearray-upload.html
- http://vimeo.com/10951360
- http://jrtashjian.com/2009/02/image-thumbnail-creation-caching-with-codeigniter/
- http://www.codersmount.com/2012/11/upload-image-and-create-multiple-thumbnail-sizes-in-codeigniter/
- http://smashingweb.info/code-igniter-image-uploader-file-uploader-multiple/
- http://www.reloadedpc.com/code-igniter/jquery-uploadify-2-codeigniter/
- http://www.codersmount.com/2012/11/upload-image-and-create-multiple-thumbnail-sizes-in-codeigniter/
- http://czetsuya-tech.blogspot.com/2010/05/codeigniter-file-uploading-class-fails.html#.U1XgZlWSxEI
- http://ri32.wordpress.com/2010/06/27/membuat-aplikasi-upload-dan-download-file-dengan-php/