https://books.google.com.mx/books?id=u4q6yMTI4I0C&pg=PA113&lpg=PA113&dq=Castro,+J.+(1983)+“Las+Decisiones+de+los+Consumidores,”+en+Enciclopedia+Práctica+de+Econom%C3%ADa,+Barcelona:+Ediciones+Orbis,+Vol.+2,+pp.+61-80.&source=bl&ots=vwhzb_zgBV&sig=ACfU3U2g4y0r9PY75Tk5yjTiEanh5pZctw&hl=es-419&sa=X&ved=2ahUKEwiDhOuItsbhAhXowcQHHUc2CVwQ6AEwAHoECAMQAQ#v=onepage&q=Castro%2C%20J.%20(1983)%20“Las%20Decisiones%20de%20los%20Consumidores%2C”%20en%20Enciclopedia%20Práctica%20de%20Econom%C3%ADa%2C%20Barcelona%3A%20Ediciones%20Orbis%2C%20Vol.%202%2C%20pp.%2061-80.&f=false