This resource focuses on helping students distinguish between primary and secondary sources while analyzing a historical advertisement. The learning objective is to enable students to identify unique biases in different primary sources based on their intent. Through a structured analysis routine, students observe the source, contextualize its creation, and infer its purpose. They then compare the purpose of a newspaper advertisement with a personal diary entry, discussing the differing perspectives and biases presented. This encourages students to think critically about the motivations behind historical documents and prepares them to articulate how understanding an author's goal can reveal deeper truths within the context of history.