Label: Source – A Reference to a resource from which the present resource is derived. The present resource may be derived from the Source resource in whole or part. Recommended best practice is to reference the resource by means of a string or number conforming to a formal identification system. Include in this area information about a resource that is related intellectually to the described resource but does not fit easily into a Relation element.

Examples:

Source=”Image from page 54 of the 20th c. edition of Manaki brothers”