As a rule of thumb, these are the three basic elements, but this will vary with the type of source:
When you use images or researched information within a visual aid (like a PowerPoint), it is important that you cite it properly. A title slide and full Works Cited is important within your visual aid, but you still must cite your sources out loud when you use or refer to them.
For articles, give the author name (if relevant), the date, and the title of the publication.
The title of the article does not need to be stated, but may be included if relevant. You also do not need to include the page number or the name of the database/library where the article was found.
For books, give the title, the year of publication, and a brief mention of the author's credentials.
There is no need to mention the page or publisher.
If you are citing a website you need to establish the credibility, currency and objectivity (fact vs. opinion) of the site.
Tip: If you cannot find this information on a web site, you may want to consider finding a different source.
In an oral citation of a website, you do not need to give the URL.
When citing an interview, give the person's name and credentials, date of interview, as well as the fact that the information was obtained from a personal interview: