An enumerative bibliography is a systematic list of books and other works such as journal articles. Bibliographies range from "works cited" lists at the end of books and articles, to complete and independent publications. A notable example of a complete, independent publication is Gow's "A. E. Housman: A Sketch, Together with a List of His Classical Papers" (1936). As separate works, they may be in bound volumes such as those shown on the right, or computerized bibliographic databases. A library catalog, while not referred to as a "bibliography," is bibliographic in nature. Bibliographical works are almost always considered to be tertiary sources.