Whenever you use resources of any kind to complete an assignment, you are required to cite your sources. This means assembling a bibliography and possibly using in-text citation. Not to do so is plagiarism, the act of intentionally or unintentionally using another persons work, ideas, or language without acknowledging the source.
Use one of the following citation generators to create your bibliography. If you have not been told otherwise, use MLA Style.
NoodleTools
NoodleTools Tutorials
Some sources for information on citation and plagiarism:
Duke University Libraries' Guide to Citing Sources
Purdue Online Writing Lab (OWL)
PlagiarismChecker.com
Plagiarism.org
MLA Style Guide