This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
You need a way to connect the recorder to the laptop. After that, it's
really no different from a desktop.
You can connect a typical recorder via USB (if you have a USB connector),
SCSI (if you have a port or want to buy a PCMCIA SCSI card like the
Adaptec 1460), FireWire (if supported or you have a PCMCIA 1394 card),
or parallel port. SCSI is the fastest, but PCMCIA SCSI adapters tend
to be expensive. FireWire is the next best bet. USB is a good choice,
and should be available on most recent laptops, but you're limited to
recording at 6x or less with USB v1.x.. Parallel port works fine, but
you will probably be limited to recording at 2x.
A small selection of portable CD recorders is now available. These are small,
battery-powered devices that come with a PCMCIA connection. Examples include
the Ricoh MP-8040SE and Smart & Friendly Pocket RW.
In some cases it may be possible to replace the CD-ROM drive included in
the laptop with a CD recorder.
Search section (5-1) for "portable" devices.