APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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