Cita APA (7a ed.)

Johnson, H. G. (2013). Aspects of the theory of tarriffs. Routledge.

Cita Chicago Style (17a ed.)

Johnson, Harry G. Aspects of the Theory of Tarriffs. London ; New York: Routledge, 2013.

Cita MLA (8a ed.)

Johnson, Harry G. Aspects of the Theory of Tarriffs. Routledge, 2013.