8[1]Berlin LE, Bednash GD, Hosier KL. 1998~1999 Enrollment and Granduatious in Baccalaureate and Graduate Programs in Nursing[M]. Washington, D.C.American Association of colleges of Nursing , 1993:3
9[2]Barbarach, Susan RJ. Contemporarg Nursing; issues, trends, and management[M]. Mosby Company , 1999:78-82