Cita APA (7th ed.)

Lengyel, P. (1971). Approaches to the science of socio-economic development. Unesco.

Cita Chicago (17th ed.)

Lengyel, Peter. Approaches to the Science of Socio-economic Development. Paris: Unesco, 1971.

Cita MLA (9th ed.)

Lengyel, Peter. Approaches to the Science of Socio-economic Development. Unesco, 1971.