APA引文

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

Trích dẫn kiểu Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.