1. Ebsco (Ryan & Fahy, 2012)
2.Ebsco (Levy, 2012)
3.Ebsco (Homburg, Artz, & Wieseke, 2012)
4.Ebsco (Tadajewski & Jones, 2012)
5.Ebsco (LaPointe, 2013)
6.Science Direct (Adhikari, Kuruppu, & Matilal, 2013)
7. Science Direct (Deegan & Soltys, 2007)
8. Science Direct (Parker, 2012)
9. Science Direct (Saudagaran & Diga, 1998)
10. Science Direct (Spicer, 1992)
11.Scholar (Week, 2000)
12. Scholar (Ottman & Books, 1998)
13. Scholar (Friedman, 2007)
14. Scholar (Cooper & Schindler, 2003)
15. Scholar(BUSINESS, 2003)
16. Scholar (Skyrme, Amidon, & Intelligence, 1997)
17. Scholar (Lewis & Churchill, 1983)
18. Scholar (Ford et al., 2003)
19. Scholar(Burns & Mitchell, 1946)
20. Scholar (Commission, 1997)
21. Scholar (Stouffer et al., 1949)
22. Scholar(Houten et al., 1999)
23. Scholar(Auster et al., 1996)
24. Scholar(Toffler & Toffler, 1993)
25. Scholar(Richards, 1998)
26.Newspaper(Peters & Shear, 2013)
27. Newspaper (Nazario, 2013)
28. Newspaper(Liptak, 2013)
29. Newspaper(Kaplan, 2013)
30. Newspaper(Bradsher, 2013)
31.Book(Simchi-Levi, Simchi-Levi, & Kaminsky, 1999)
32.Book (Mauranen, 1993)
33.Book (Brealey, Myers, & Allen, 2006)
34.Book (La Porta, Lopez-de-Silanes, Shleifer, & Vishny, 2001)
35.Book(Embrechts, 1997)
36.Book (Hulme & Mosley, 1996)
37.Book (Choi & Choi, 1997)
38.Book (Mantegna & Stanley, 2000)
39.Book (Beck & Andres, 2004)
40.Book (Nesterov, Nemirovskii, & Ye, 1994)
41. Academic articles (Soumerai & Avorn, 1990)
42. Academic articles(Sands et al., 1997)
43. Academic articles(Blumenthal, Campbell, Anderson, Causino, & Louis, 1997)
44. Academic articles(Tesch, Wood, Helwig, & Nattinger, 1995)
45. Academic articles(Hyland, 1994)
46. Academic articles (Hyland, 1998)
47. Academic articles (Hyland, 2002)
48. Academic articles (Linn, Yager, Cope, & Leake, 1985)
49. Academic articles(Duckworth & Seligman, 2005)
50....