Cita APA

Purcell, D., & Anderson, J. R. (1997). Agricultural extension and research: Achievements and problems in national systems. Washington, D.C.: World Bank.

Citación estilo Chicago

Purcell, Dennis, y Jock R. Anderson. Agricultural Extension and Research: Achievements and Problems in National Systems. Washington, D.C.: World Bank, 1997.

Cita MLA

Purcell, Dennis, y Jock R. Anderson. Agricultural Extension and Research: Achievements and Problems in National Systems. Washington, D.C.: World Bank, 1997.