it depends on the person who is writing it, to figure this out we would need more information such as what point of veiw it is in, or maybe is it nothing but facts for example, Anne Franks diary would be a primary source because it is what happened to Anne Frank from her point of view but a book named something like the history of Anne Frank and the Holocaust 100 years later would be a secondary source because it is taking information about the time period, maybe even using primary sources to write about it
