APA (7th ed.) Citation

Kelen, A. (2001). The gratis economy: Privately provided public goods. CEU Press.

Chicago Style (17th ed.) Citation

Kelen, András. The Gratis Economy: Privately Provided Public Goods. Budapest: CEU Press, 2001.

MLA (9th ed.) Citation

Kelen, András. The Gratis Economy: Privately Provided Public Goods. CEU Press, 2001.

Warning: These citations may not always be 100% accurate.