Many of the databases you use to find online articles, videos and e-books will have a citation function. Look for an icon that says Citation Tools, Cite this!, or something similar. Many of them will let you choose the style (APA, for example) that you need. You can then cut and paste the citation into your document.
Programs such as Endnote and Zotero let you build collections of citations and then generate bibliographies. UTSA provides copies of Endnote to members of the university community.