„SICP: Foreword”. Архивирано из оригинала 27. 07. 2001. г. Приступљено 19. 04. 2016. „Lisp is a survivor, having been in use for about a quarter of a century. Among the active programming languages only Fortran has had a longer life.”
„SICP: Foreword”. Архивирано из оригинала 27. 07. 2001. г. Приступљено 19. 04. 2016. „Lisp is a survivor, having been in use for about a quarter of a century. Among the active programming languages only Fortran has had a longer life.”