While reading his political science textbook, Ted became interested in the Louisiana Purchase, which was discussed briefly in one of the chapters. If Ted wants to locate the primary source from which the author obtained information about the Louisiana Purchase, he should .

check for a reference list at the end of the chapter or end of the book.

Explanation:

A reference list can be defined as the list of reference resources that the author has used while writing a book or thesis. This list is helpful for the readers to refer to the sources or learn more about the topic you have written about. A reference list is helpful to avoid plagiarism in your work by giving rightful credit to the authors from whom you have borrowed the ideas in your text.

In the given case, Ted can refer to this reference list that might be listed at the end of the chapter or the book. As the author would have mentioned the sources from which he has ideas and taken help from.

Thus the correct answer is a reference list at the end of the book or chapter.

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