5Table251 Degrees conferred by degree-granting institutions, by level of degree and sex of student: Selected years, 1869-70 through 2015-16[EB/OL]. http://nces. ed. gov/programs/digest/d06/tables/dt06 _ 251. asp, 2008-01-26.
6CLIFTON F CONRAD, JENNIFER G HAWORTH, SUSAN B MILLAR. A silent success: Master's education in the United States[M]. The Johns Hopkins University Press, 1993.
7BURDON R CLARK. The Research Foundation of Graduate Education Germany, Britain, France, United States, Japan [M]. University of California Press, 1993. 239.
8Table258 Degrees conferred by degree-granting institutions, by level of degree and sex of student: Selected years, 1869-70 through 2015-16[EB/OL]. http://nces. ed. gov/programs/digest/d06/tables/ dt06_ 258. asp, 2008-01-26.
9Programs by fields[EB/OL], http://www. sciencemasters. com/PSM Program list/Programs by field/ tabid/81/Deanlt. aspx, 2007-11-15.
