1.
Melvyn P. Leffler: The Cold War: What Do ‘We Now Know’? The American Historical Review. 104, 501–524 (1999).
2.
Shuster, La: BUSINESS. Civil Engineering. 81, (2011).
3.
Pride, W.M., Hughes, R.J., Kapoor, J.R.: Business. Houghton Mifflin Co, Boston (2002).