CIRAD, 2000
Buku Teks
Booth, Anne, author
Allen and Unwin, 1988
Buku Teks
Herrick, Bruce H., author
McGraw-Hill, 1983
Buku Teks
Galbraith, John Kenneth, 1908-2006, author
Harvard U.P, 1964
Buku Teks
Galbraith, John Kenneth, 1908-2006, author
Houghton Mifflin, 1964
Buku Teks