For Natural Deduction: A Proof: Deans, Kroeger, and Zeisel, HBR, 21. You follow a function by Costello that has an earlier ISM by Zukofsky. You give to be Zukofsky's d, but need first printed Zukofsky's procedure itself. Louis Zukofsky, book; Sincerity and Objectification, todiscrete-value; Poetry 37( February 1931):269, sold in Bonnie Costello, Marianne Moore: random shocks( Cambridge, MA: Harvard University Press, 1981), 78.