Cita APA (7a ed.)

Smettan, J. R. (2003). The shadow economy in Frankfurt-Bornheim: Results of an empirical study. The informal economy: threat and opportunity in the city, 323-397.

Cita Chicago Style (17a ed.)

Smettan, Jürgen Rüdiger. "The Shadow Economy in Frankfurt-Bornheim: Results of an Empirical Study." The Informal Economy: Threat and Opportunity in the City 2003: 323-397.

Cita MLA (9a ed.)

Smettan, Jürgen Rüdiger. "The Shadow Economy in Frankfurt-Bornheim: Results of an Empirical Study." The Informal Economy: Threat and Opportunity in the City, 2003, pp. 323-397.