Final answer:
A market value appraisal prepared for engaging organizations is not a secondary research source because secondary research involves analyzing existing information, whereas appraisals are original, primary data.
Step-by-step explanation:
All options listed are considered sources of secondary research except for a market value appraisal prepared for the engaging organizations. This is because secondary research usually involves the analysis of existing information compiled and collected by others. Examples of secondary research sources include published court cases, academic publications, databases with historical market transactions, and more.
Appraisals are typically considered primary data as they are original documents created for a specific purpose and not analyses of previously existing documents. Databases that contain historical market transactions, such as stock market data or real estate records, can be used to gather information for secondary research in finance, economics, or other related fields. In conclusion, all of the options listed in the question can be considered information sources for secondary research.