Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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