Wagner, K., & Ark, B. v. (1996). International productivity differences: Measurement and explanations. Elsevier.
芝加哥风格引文Wagner, Karin, 与 Bart van Ark. International Productivity Differences: Measurement and Explanations. Amsterdam: Elsevier, 1996.
MLA引文Wagner, Karin, 与 Bart van Ark. International Productivity Differences: Measurement and Explanations. Elsevier, 1996.
警告：这些引文格式不一定是100％准确.