Cita APA (7th ed.)

Callmann, R. (1950). The law of unfair competition and trade-marks (2nd ed.). Callaghan.

Cita Chicago (17th ed.)

Callmann, Rudolf. The Law of Unfair Competition and Trade-marks. 2nd ed. Chicago: Callaghan, 1950.

Cita MLA (9th ed.)

Callmann, Rudolf. The Law of Unfair Competition and Trade-marks. 2nd ed. Callaghan, 1950.