Reference management programs allow you to build a personal database of your references to articles, books, websites - any information source - and then easily create bibliographies and reference lists using any particular style, without having to retype or reformat. See this comparison of reference management programs and overview of reference manager programs widely used at Dartmouth.
Zotero is an open source program that you download for free; it works well as a Firefox extension on all platforms but there is now a standalone option too. Zotero is great at grabbing descriptive information from web pages that allows you to cite that page. It will also save full text and associate that with your reference. Zotero downloads RIS formatted references. Help with Zotero
RefWorks is a web-based reference management program that allows users to create their own personal database of references by importing references from online databases (eg Web of Science). Beginning December 2018, Dartmouth Library will no longer subscribe to or support RefWorks, and we recommend against signing up for a new account. Current RefWorks users who wish to export their reference libraries are encouraged to do so by November 2018. How best to do this is described on the Library Research Guide Cite & Manage Sources: Transitioning from RefWorks. You can also get individual help from the librarians
From this source, a brief description of the Author-Date style: "The author-date system of documentation comprises two indispensable parts: a complete list of sources cited, often called a reference list (the term used in this chapter), and very brief text citations, usually enclosed in parentheses."