research methods

Please see the article attached. Please read and complete the assignment below:
After reading the article, please provide a 2 page summary of at least 2 different research methods utilized by the author(s) to gather the data  / information for their research. Please explain at least 1 possible strength and 1 weakness of each of the 2 methods used to complete the research. Please use AP / MLA style.
Gau, Brunson – Procedural justice and policing.pdf
By submitting this paper, you agree: (1) that you are submitting your paper to be used and stored as part of the SafeAssign services in accordance with the Blackboard Privacy Policy; (2) that your institution may use your paper in accordance with your institution’s policies; and (3) that your use of SafeAssign will be without recourse against Blackboard Inc. and its affiliates.