Purcell, D., & Anderson, J. R. (1997). Agricultural extension and research: Achievements and problems in national systems. Washington DC: World Bank.
Чикагска система за цитиранеPurcell, Dennis., и Jock R. Anderson. Agricultural Extension and Research: Achievements and Problems in National Systems. Washington DC: World Bank, 1997.
MLA формат за цитиранеPurcell, Dennis., и Jock R. Anderson. Agricultural Extension and Research: Achievements and Problems in National Systems. Washington DC: World Bank, 1997.
Внимание: Тези цитати може да не са 100% точни.