TY - BOOK TI - Mathematics in action : algebraic, graphical, and trigonometric problem solving Preliminary ed AU - Bertelle, Ralph. SN - 0201383187 PB - Addison-Wesley PP - Reading, MA : Addison-Wesley, 1999. PY - 1999 UR - https://library.korea.ac.kr/detail/?cid=CAT000000658384&ctype=m