For referencing in Wikipedia, see Citing sources.

In general, a reference is something that refers to or designates something else, or acts as a connection or a link between two things. The objects it links may be concrete, such as books or locations, or abstract, such as data, thoughts, or memories. The object which is named by a reference, or to which the reference points, is the referent.

The term reference is used with different specialized meanings in a variety of fields, as follows:

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Library of Congress: What's New in Science Reference

New Webcast: Jeanne Guillemin's American Anthrax (2011)
May 16, 2012 Jeanne Guillemin discusses her new book, American Anthrax: Fear, Crime, and Investigation of the Nation's Deadliest Bioterrorist Attack (2011) , a definitive account of the five-year investigation into the 2001 anthrax attacks. You can also view this on the LC YouTube channel Topics in Science playlist URL: http://www.youtube.com/user/LibraryOfCongress
New Science Reference Guide: Bioterrorism and Bio-Weapons
May 2, 2012 This guide represents a selection of books, technical reports, and Internet resources on bioterrorism and bio-weapons.
New Science Tracer Bullet: Science and Technology in South Korea
May 2, 2012 This bibliographic guide provides English language sources available in the Library of Congress on scientific and technological developments in South Korea from antiquity to the present.
Upcoming Lecture: A Rare Astronomical Event- Transit of Venus
On June 5, 2012, the planet Venus will move across the face of the sun. Such transits of Venus are among the rarest of planetary alignments, and they come in pairs that are eight years apart but separated by more than a century. Only six such events have occurred since the invention of the telescope, according to NASA scientist Sten Odenwald. Odenwald will discuss "A Rare Astronomical Event: Transit of Venus" at 11:30 a.m. on Tuesday, May 8, in the Mary Pickford Theater on the third floor of the James Madison Building, 101 Independence Ave. S.E., Washington, D.C. The event is free and open to the public. Tickets are not needed.
New Reference Guide: National Recovery Administration (NRA)- an Inventory of Publications in the Collections of the Library of Congress
This guide from our Business Reference Service represents an inventory of several of the major series issued by the United States National Recovery Administration between 1933 and 1935, such as administrative and statistical materials, codes of fair competition, and press releases. In a short two years, 557 Codes were approved by the President, and hundreds more were proposed and either revised or not approved. There is over 11,000 documented press releases, almost one hundred sets of working papers, and innumerable amendments, supplements, and revisions- most of which are housed in the General Collections of the Library of Congress.
New LC Science Tracer Bullet: Economic Botany- Useful Plants and Products
This guide offers a systematic approach to the wide variety of published materials on the use of plants by people. It includes references to materials on food plants, fiber plants, dye plants, edible plants, medicinal plants, oilseed plants, as well as plants used in ceremonies, cultivated for commercial purposes, or used as shelter.

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