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).(81)

university of california los angeles.(67)

walden university.(61)

university of california berkeley.(52)

university of minnesota.(50)

harvard university.(46)

columbia university.(45)

georgetown university.(43)

arizona state university.(42)

city university of new york.(42)

university of washington.(42)

university of michigan.(37)

new york university.(31)

the university of north carolina at chapel hill.(31)

alliant international university.(30)

michigan state university.(30)

the university of chicago.(30)

university of southern california.(30)

university of california irvine.(29)

boston university.(27)

the university of wisconsin - madison.(26)

indiana university.(25)

the pennsylvania state university.(25)

capella university.(24)

university of illinois at urbana-champaign.(23)

university of maryland college park.(23)

princeton university.(22)

the chicago school of professional psychology.(22)

the university of arizona.(22)

university of colorado at boulder.(22)