Creating bootable usb os x installer

If you have an installation dvd,you can go ahead and use that,but if you don't,then you can use the disk utilities to make a bootable usb.You'll need the iso file and a usb of the appropriate storage capacity for this.There are also other good softwares on the net that cater to your need.(I recently dual booted and installed Linux and Mac OS X 10.10.3 on my MBP using a LiveDVD that I made).

So you can use the .dmg to make a bootable USB.

http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install -drive.html

for Mavericks, no longer available.

For Mountain Lion:

http://mac-how-to.wonderhowto.com/how-to/create-bootable-install-dvd-usb-drive-o s-x-10-8-mountain-lion-0138303/

You need Mountain Lion installer to create bootable USB installer.

http://www.macworld.com/article/1167857/how_to_make_a_bootable_mountain_lion_ins tall_drive.html

http://www.tips-and-tricks-in-mavericks.com/how-to-create-an-os-x-mavericks-inst all-drive/