edited by Christina Hughes
Open University Press, 2003
Buku Teks
Rees, Colin, author
Churchill Livingstone/Elsevier, 2012
Buku Teks
edited by David M. Fetterman
Jossey Bass, 1991
Buku Teks
Blalock, Hubert M., author
Prentice-Hall, 1970
Buku Teks
Blalock, Hubert M., author
Prentice-Hall, 1982
Buku Teks