A bibliography is a list of sources used or cited in a research paper or other work. It provides essential information about each source, including author, title, publisher, and date. There are several types of bibliographies, including systematic enumerative bibliographies that list all published works on a topic, current selection aids that evaluate recently published materials, and bibliographies of bibliographies that catalog other bibliographies. Bibliographies follow consistent formatting principles and are compiled based on guidelines to ensure accuracy and logical arrangement of sources.