The Emory Writing Center offers personalized one-to-one support for writing assignments. You can book sessions with tutors by appointment or drop-in during walk-in hours.
Citing material -- by including it in a bibliography and by using in text citations -- allows readers to know whose ideas you are using. This gives the original authors credit, and it forms the basis of your own authority as a writer.
The role of a citation is for your reader to be able to see easily where your evidence comes from, and to track down and read or view those materials themselves:
Citation styles are based on disciplines and are a central feature of the scholarly conversation. Part of forming your own authority as a writer is using the citation style correctly -- including things like correct punctuation.
For examples and help, see the Purdue Online Writing Lab -- Research & Citation Resource
Emory library also provides a guide to citation.
If you are not sure which citation style to use, this guide has helpful advice structured by discipline. You may also want to check with the intended recipient of your work to see if they have specific style requirements.