Principles of microeconomics / Roy J. Ruffin, Paul R. Gregory. - 3rd ed.. - Glenview : Scott, Foresman a. comp., [1988]. - xxviv, 508, 13, 12 p. : fig. ; 25 cm.см.. - ISBN 0-673-18882-5[MFN: 13159]
UDC: 330.101.542
• Gregory, Paul R.;
E 16.505/4 = 330.101.542/R-89 - Civil Education Reading Hall