ebrary, Inc, Wolfrum, R., Stoll, P., & Feinäugle, C. (2008). WTO--trade in services. Martinus Nijhoff Publishers.
芝加哥风格引文ebrary, Inc, Rüdiger Wolfrum, Peter-Tobias Stoll, 与 Clemens Feinäugle. WTO--trade in Services. Leiden ; Boston: Martinus Nijhoff Publishers, 2008.
MLA引文ebrary, Inc, et al. WTO--trade in Services. Martinus Nijhoff Publishers, 2008.
警告：这些引文格式不一定是100％准确.