For your assignments you are generally expected to use predominantly peer-reviewed journal articles in your work. Depending on your topic, books and book chapters also might be relevant to cite. However, there are certain topics that will require you to cite non-scholarly works, including grey literature.
When in doubt, check in with your instructor before citing it.
Generally you should not cite a prior thesis/dissertation. Instead, you should be citing the source of the claim made in the thesis/dissertation.
Even if you can't cite a dissertation directly, you can use dissertations to find other potentially relevant literature on your topic through their bibliography!
Seminal works, sometimes called landmark, pivotal, foundational, or keystone articles, are texts that are influential and groundbreaking, often introducing new ideas or approaches and significantly shaping the research that comes after them. Seminal works are cited frequently in the research, so if you see the same citation in almost every article you read, there's a good chance it's a seminal work! Although these articles may have been published decades ago, their significance to the field makes them important works to read and understand.
Unfortunately, there isn't usually a list or label for articles or books that are considered seminal. You will need to rely on your own exploration of the scholarly literature to determine which works hold significance, are cited frequently, and have influenced the work of others.
Generally, you don't need to only cite sources from the last 10 years. While you should be citing the most up-to-date information available, there may be important works for you to cite from works that are older. For example, it would be unusual to write a thesis on Adlerian psychology without quoting from Adler's work, all of which was written more than 10 years ago.
However, if your instructor has specified only using sources from a particular time period, you should conform to the assignment expectations.
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