See "The Old Kingdom and First Intermediate Period," 408 KB pdf-file, Cleveland Museum of Art, pp. 52–53. Note too that footnote 2 (referring to the short rod in his right hand as folded cloth) on page 51 references Henry G. Fischer, "An Elusive Shape within the Fisted Hands of Egyptian Statues" in Ancient Egypt, pp. 143–155, for which no date is provided but most probably refers to: ISBN 0-87099-222-8 and ISBN 0-87099-159-0.