Best official doc is the blueprints,
from the IaaS doc:
5.3 Building a vCloud Test Environment
All VMware products, including vSphere 5 and vCD 1.5, can be downloaded and evaluated for 60 days.
from VCP-Cloud:
5.3 Building a vCloud Test Environment
All VMware products, including vSphere 5 and vCloud Director 5.1, can be downloaded and evaluated for 60 days.
VCP-Cloud includes vSphere and has more questions (same # of cloud, but adds vSphere) but covers 5.1
If you don't want to study 1.5 and have recently passed VCP5-DCV (so you don't have to study it again) then VCP-Cloud is a good option.