Forster, G. W., & Leager, M. C. (1950). Elements of agricultural economics. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Forster, Garnet Wolsey, agus Marc Carl Leager. Elements of Agricultural Economics. New York: Prentice-Hall, 1950.
Lua MLA (9ú heag.)Forster, Garnet Wolsey, agus Marc Carl Leager. Elements of Agricultural Economics. Prentice-Hall, 1950.