You need to give credit to sources for several reasons:
Keep Track of Your Sources
As you search across Google, the library website, and other resources, save materials you plan to use. Either print them out or save them electronically.
Take Good Notes
Keep a list of all the sources (including page numbers or URLs) you gathered. Mark the section(s) of sources you will use.
Ask Your Professor
If you have a question about integrating sources into your paper, ask your professor.
Plan ahead! Do not wait until the last minute, as this will lead to sloppy work. Stay organized.
Consult these resources for more info on avoiding plagiarism, quoting, and paraphrasing: