In medical communication it is always important to cite your sources. In your summaries for Karen's case you should cite the evidence you found on your PubMed search and use it to reach your conclusion about Karen’s case.

In medicine the format for bibliographic citations is the following: Author/Year/Title of article/ Name of Journal/ Volume/Issue/ pages

For example:

Chan S, Brown S, Davis T, et al Acute bacterial gastroenteritis: a study of adult patients with positive stool cultures treated in the emergency department Emergency Medicine Journal (2003) 20; 335-338

For your final exam and for your thesis you need to download a bibliographic software. See the link below and start now!