MacWorld
http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install-drive.html
Note: As I explained in our main Mavericks-installation article, if you leave the Mavericks installer in its default location in the Applications folder when you install OS X 10.9, the installer will be deleted automatically after the installation finishes. So if you plan to use that installer on other Macs, or—in this case—to create a bootable drive, be sure to copy the installer to another drive, or at least move it out of the Applications folder, before you install. If you don't, you'll have to redownload the insta