Beeby, C. E.
New Zealand Council for Educational Research, 1979
Buku Teks
edited by Harold J. Burbach
Pendell, 1977
Buku Teks
Potter, Patricia A.
Mosby , 1998
Buku Teks SO
Jones, Karen
Elsevier, 2011
Buku Teks SO
edited by Richard Keefe
Springer Healthcare, 2012
eBooks