ASA style guide:
Zotero is a free, open-source, web-based tool for managing citations, organizing pdfs, and creating bibliographies. Self-guided instruction in the form of tutorials, FAQs, and help is available through Zotero's support page.
Give credit where credit is due. By properly citing the sources you use in your research projects you are both identifying the resources that you used to complete your work and you are formally acknowledging the authors or creators of those resources.
Please read the Cornell University Code of Academic Integrity.