Edward Arnold (Publishers) Ltd., 1978
Buku Teks
Francis, Philip H., author
AMACOM, 1977
Buku Teks
Cohen, R. L.
The University Press, 1955
Buku Teks
National Research Institute of Agricultural Economic, Ministry of Agriculture, Forestry and Fisheries , 2000
Buku Teks
N. Samsom N.V., 1953
Buku Teks