Peña, R. de la (1979) «Cornelius P. A. Bartels. Economic aspects of regional welfare : income distribution and unemployment. Leiden : Martinus Nijhoff, 1977. 261 p. (Studies in applied regional science ; v. 9)», Estudios Demográficos y Urbanos, 13(01), pp. 92–93. doi: 10.24201/edu.v13i01.459.