(2006). . Nivar, 31(60-61), 20-31.
. "", Nivar, 31, 60-61, 2006, 20-31.
(2006). '', Nivar, 31(60-61), pp. 20-31.
, "," Nivar, 31 60-61 (2006): 20-31,
. Nivar, 2006; 31(60-61): 20-31.
