PENG, Mike W., brez datuma, Global business [na spletu]. Australia [etc. : South-Western. [Dostopano 21 januar 2025]. Pridobljeno s: http://websites.swlearning.com/cgi-wadsworth/course_products_wp.pl?fid=M20bI&flag=instructor&product_isbn_issn=9780324585940&discipline_number=416&template=AISE