Graham, Benjamin, 1894-1976. (2003). The intelligent investor : a book of practical counsel. Zweig, Jason. (Revised ed.). New York: HarperBusiness Essentials. p. 152. ISBN0-06-055566-1. OCLC51942330.{{cite book}}: CS1 maint: multiple names: authors list (link) CS1 maint: numeric names: authors list (link)