TY - BOOK TI - Po : beyond yes & no AU - De Bono, Edward, 1933- SN - 0140137823 PB - Penguin Books PP - London, England ; New York, N.Y. : Penguin Books, 1990, c1972. PY - 1990 UR - https://library.korea.ac.kr/detail/?cid=CAT000000482530&ctype=m