With the emergence of the global art market in the latter half of the 20th century, art itself became a commodity. The financial volume exchanged in buying and selling artworks surpassed all expectations. As a result, art began to gain more recognition not only through aesthetic standards but also through its rising material value. This shift—the transformation of the art world into an art market—has altered the nature, purpose, and influence of everything involved in certifying an artwork as authentic. For this reason, we will focus on art books and/or catalogues raisonnés as reliable sources for authenticity verification and their impact on an artist's market.