Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

Purcell, Dennis L., και Jock R. Anderson. Agricultural Extension and Research: Achievements and Problems in National Systems. World Bank, 1997.