Zon, Hans van, 1949-, author
Palgrave Macmillan, 2016
Buku Teks
Salaman, Redclife N., author
Cambridge University Press, 2014
Buku Teks
James, William, author
Mentor Books, 1958
Buku Teks
Hickey, Raymond, 1954-, author
Wiley Blackwell, 2014
Buku Referensi
Moran, Marie, author
SAGE, 2015
Buku Teks