Beeby, C.E.
New Zealand Council for Educational Research, 1979
Buku Teks SO
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
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