These are great sources for your project. Remember that you also need to include at least two primary sources--those could include the writing of hippies or beats like Ken Kesey or Jack Keroac, or primary sources could be newspaper reports about the hippie generation that were published in the 1960s.
Also include a couple of academic secondary sources. Those include peer-reviewed articles or books published by university presses. You can find them by using the CNM Libraries search feature (https://www.cnm.edu/depts/libraries) or by searching Google Books.
Please let me know if you have questions or if I can help with anything!