McKenzie, Richard B., author
McGraw-Hill, 1978
Buku Teks
Craven, John, 1949-, author
Blackwell, 1984
Buku Teks
Wonderling, David, author
Open University Press, 2005
Buku Teks
by Pauline Mulholland ... [et al.]
Pitman, 1983
Buku Teks
Lipsey, Richard G., 1928-, author
Harper Collin, 1996
Buku Teks