TY - BOOK TI - Essentials of learning 4th ed AU - Travers, Robert Morris William , 1913-. SN - 0024213500 PB - Macmillan PP - New York : Macmillan , 1977. PY - 1977 UR - https://library.korea.ac.kr/detail/?cid=CAT000000233300&ctype=m