, M., , P. (2013). knowledge gap and income gap comparative study between. kirkuk university journal for scientific studies, 35(112), 307-323.
Mohamad N.Mahmood ; PhD . "knowledge gap and income gap comparative study between". kirkuk university journal for scientific studies, 35, 112, 2013, 307-323.
, M., , P. (2013). 'knowledge gap and income gap comparative study between', kirkuk university journal for scientific studies, 35(112), pp. 307-323.
, M., , P. knowledge gap and income gap comparative study between. kirkuk university journal for scientific studies, 2013; 35(112): 307-323.