This thread discusses restoring Windows 8 from a factory recovery partition, something that may be relevant to your friend's system.
http://www.eightforums.com/installation-setup/18494-clean-install-windows-8-without-install-disc.html
It is actually pretty normal for a system to ship without a Windows install disc, even back with the Windows 7 systems I have bought. Creating a disc from an ISO you find can be an issue, or at least it has been for me. I have decent collection of Windows ISOs dating back to XP, and I know the Windows 8 ISOs are tied to a their specific keys and will not work with any other. Now, these are system builder copies and not OEM. By OEM, I am referring to the copies used by the original manufacturers such as HP, Dell, ect.
This thread talks about this:
http://www.tomshardware.com/forum/3591-73-install-active-windows-change-hard-drive
The product key for the original install of Windows 8 should be part of the system's BIOS. You can try to create a functional copy of Windows 8 by using an Upgrade, in theory it should look to your BIOS for a key and take it from there.
My suggestion would be to contact the laptop's OEM and ask about getting a physical copy of the media or a recovery copy. If available, they will likely charge for this but likely less than a new system builder copy.