中国科学技术信息研究所--国家工程技术数字图书馆

university of toronto (canada).(36)

northcentral university.(33)

columbia university.(30)

capella university.(19)

walden university.(16)

harvard university.(15)

michigan state university.(14)

indiana university.(13)

the ohio state university.(13)

rutgers the state university of new jersey - new brunswick.(12)

teachers college columbia university.(12)

the university of north carolina at greensboro.(12)

university of minnesota.(12)

arizona state university.(10)

university of illinois at urbana-champaign.(10)

miami university.(9)

new york university.(9)

university of california berkeley.(9)

university of kansas.(9)

kent state university.(8)

the florida state university.(8)

university of california los angeles.(8)

university of colorado at boulder.(8)

university of hawai'i at manoa.(8)

university of oregon.(8)

university of pittsburgh.(8)

indiana state university.(7)

mcgill university (canada).(7)

state university of new york at albany.(7)

temple university.(7)