Cita APA (7a ed.)
(1990). Agricultural Research. U.S. Department of Agriculture.
Cita Chicago Style (17a ed.)
Agricultural Research. Washington: U.S. Department of Agriculture, 1990.
Cita MLA (9a ed.)
Agricultural Research. U.S. Department of Agriculture, 1990.
Precaución: Estas citas no son 100% exactas.