1.
Melvyn P. Leffler. The Cold War: What Do ‘We Now Know’? The American Historical Review [Internet]. 1999;104(2):501–524. Available from: http://www.jstor.org/stable/2650378?origin=JSTOR-pdf&seq=1#page_scan_tab_contents
2.
Shuster, La. BUSINESS. Civil Engineering [Internet]. 2011;81(1). Available from: 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
3.
Pride WM, Hughes RJ, Kapoor JR. Business. 7th ed. Boston: Houghton Mifflin Co; 2002.
