TY - BOOK T1 - Business research methods A1 - Cooper, Donald R A2 - Emory, C. William LA - English PP - Burr Ridge etc. PB - Irwin YR - 1995 ED - 5th ed. UL - https://colectivo.uloyola.es/Record/L49899 OP - 681 SN - 0256137773 KW - Investigación comercial : Metodología ER -