Final answer:
A book about Thomas Paine's Common Sense would be a secondary source, providing analysis and interpretation of the primary work.
Step-by-step explanation:
A book about Thomas Paine's Common Sense is an example of a secondary source. Primary sources are original documents from a particular period, like diary entries, government documents, or original works such as Common Sense itself. In contrast, secondary sources interpret and analyze primary sources; therefore, a book discussing and analyzing Common Sense would be providing a secondhand account and interpretation of Paine's work, making it a secondary source.