Naidoo, Jennie, author
Elsevier, 2016
Buku Teks
Wicks, Rollo E.
N.Y. State Univ. of New York , 1958
Buku Teks
Goss, David
Routledge, 1991
Buku Teks
Sanday, A.P., author
Hodder and Stoughton, 1979
Buku Teks
Bilton, John
Royal Flying Doctor Service of Australia, 1961
Buku Teks