The article "The Silent Sibling: How Current Autism Intervention Neglects Typically-Developing Siblings" by Julie Sweigert discusses the impact of current autism interventions on the typically-developing siblings of individuals with autism. In order to identify the types of sources used in the article, it is important to understand the distinctions between primary, secondary, and tertiary sources. A primary source is an original piece of research or firsthand account of an event. It provides direct evidence or data without interpretation or analysis by anyone else. Examples of primary sources include scientific studies, diaries, letters, interviews, and original works of art. Primary sources are important because they provide the most direct and unfiltered evidence. A secondary source is a source that interprets or analyzes primary sources. It is created by someone who did not directly participate in the event or conduct the research. Examples of secondary sources include textbooks, review articles, and scholarly work that analyzes and interprets primary sources. Secondary sources are valuable because they provide context and analysis of primary sources. A tertiary source is a source that compiles information from primary and secondary sources. It presents information in a summarized or condensed form, often for the purpose of providing an overview or introduction to a topic. Examples of tertiary sources include encyclopedias, dictionaries, textbooks, and reference books. Tertiary sources are useful for gaining a general understanding of a topic or finding quick facts. In the article "The Silent Sibling: How Current Autism Intervention Neglects Typically-Developing Siblings," Julie Sweigert primarily utilizes secondary sources to support her argument about the neglect of typically-developing siblings in current autism interventions. She references several scholarly articles and books that analyze and interpret primary research on autism intervention. These secondary sources provide Sweigert with evidence and expert opinions to support her claims. However, Sweigert also includes primary sources in her article to provide firsthand accounts and perspectives. For example, she quotes from interviews with typically-developing siblings of individuals with autism to highlight their experiences and feelings of neglect. These primary sources add a personal and emotional dimension to the article. Overall, the article "The Silent Sibling: How Current Autism Intervention Neglects Typically-Developing Siblings" can be classified as a mix of primary and secondary sources. Sweigert primarily relies on secondary sources to support her argument, but also includes primary sources to enhance the reader's understanding and emotional connection to the topic.