With a citation generator, you can enter the bibliographic information of your source,  in order to produce a citation in your selected format, that you can copy and paste into your paper.

Here is a selected list of citation generators:

Noodletools Express

• single citations only, no login required.
• access the full range of Advanced MLA, APA, and Chicago forms

Zotero Bib

• creates citations and bibliographic references for MLA, APA, Turabian, and Chicago styles.
• look up your reference by URL, title, or ISBN, then it automatically converts to a citation and bibliographic reference.
• helps you build a bibliography instantly from any computer or device, without creating an account or installing any software.

EasyBib

• creates citations and bibliographic references for MLA, APA, Turabian, and Chicago styles.
• look up your reference  by URL, title, or ISBN, then it automatically converts to a citation and bibliographic reference.

"Not so helpful" APA help

Microsoft Word Professional offers an APA citation tool and some of the library databases offer APA citations. While they often contain all the elements for the citation, they are often not in correct APA style. Before relying on these citations, you will want to check with your APA manual, NoodleTools or the DU English Department's APA Documentation Style: A Brief Overview to make sure that your citation is correct.