Melvyn P. Leffler. (1999). The Cold War: What Do ‘We Now Know’? The American Historical Review, 104(2), 501–524. http://www.jstor.org/stable/2650378?origin=JSTOR-pdf&seq=1#page_scan_tab_contents
Pride, W. M., Hughes, R. J., & Kapoor, J. R. (2002). Business (7th ed). Houghton Mifflin Co.
Shuster, La. (2011). BUSINESS. Civil Engineering, 81(1). https://nusearch.nottingham.edu.cn/primo-explore/fulldisplay?docid=TN_wos000286170600010&context=PC&vid=44NOTCH&lang=en_US&search_scope=44NOTCH_REMOTE&adaptor=primo_central_multiple_fe&tab=44notch_remote&query=any,contains,business&offset=0
