Cita APA (7a ed.)

Guth, E., Ketelsen, J. V., & Lambsdorff, A. (1994). Barriers to trade and investment in the US. Europa-Institut der Universität des Saarlandes.

Cita Chicago Style (17a ed.)

Guth, E., J. V. Ketelsen, y Alexander Lambsdorff. Barriers to Trade and Investment in the US. Saarbrücken: Europa-Institut der Universität des Saarlandes, 1994.

Cita MLA (9a ed.)

Guth, E., et al. Barriers to Trade and Investment in the US. Europa-Institut der Universität des Saarlandes, 1994.