Beeby, C. E., author
Oxford University Press, 1979
Buku Teks
Beeby, C. E., author
New Zealand Council for Educational Research, 1979
Buku Teks
edited by Harold J. Burbach
Pendell, 1977
Buku Teks
Potter, Patricia A., author
Mosby , 1998
Buku Teks
Jones, Karen, author
Elsevier, 2011
Buku Teks