Lengyel, Peter.
Approaches to the science of socio economic development / Peter Lengyel - Paris : Unesco, 1971. - 383 p. : tables.
Economic development.
Social evolution.
330.9 / LEA
Approaches to the science of socio economic development / Peter Lengyel - Paris : Unesco, 1971. - 383 p. : tables.
Economic development.
Social evolution.
330.9 / LEA