Cita APA (7th ed.)

Wagner, K., & Ark, B. v. (1996). International productivity differences: Measurement and explanations. Elsevier.

Cita Chicago (17th ed.)

Wagner, Karin, i Bart van Ark. International Productivity Differences: Measurement and Explanations. Amsterdam: Elsevier, 1996.

Cita MLA (9th ed.)

Wagner, Karin, i Bart van Ark. International Productivity Differences: Measurement and Explanations. Elsevier, 1996.