Abstract: A bookmark with a retaining hook element at the top thereof to receive the upper end of the bound edge of a book and positively prevent the bookmark from shifting longitudinally and laterally of said bound edge. In one form, the bookmark is provided with a plurality of reference indicia slits along opposite edges of an elongated body and includes a plurality of elongated cord elements adapted to be inserted into one or more of said indicia slits along the edges of the body to provide reference indicia for the subject matter of the book.