Tomiyama
Institute of Social Science, University of Tokyo, 1998
Artikel Jurnal
Lindeman, Carol A.
WB Sounders company , 1999
Buku Teks SO
Lindeman, Carol A.
W.B. Saunders, 1999
Buku Teks
Green, Marilyn L.
John Wiley & Sons, 1981
Buku Teks SO
Cronin, Patricia
Mosby , 2004
Buku Teks SO