Purcell, D., Anderson, J. Agricultural Extention and Research. Washington: The World Bank, 1997 XXI, 282 с. : с табл, 0-8213-3878-1.
Purcell, D., Anderson, J. Agricultural Extention and Research. Washington: The World Bank, 1997 XXI, 282 с. : с табл, 0-8213-3878-1.
Purcell, D., Anderson, J. (1997) Agricultural Extention and Research, Washington: The World Bank XXI, 282 с. : с табл, 0-8213-3878-1.
Purcell, D., & Anderson, J. (1997). Agricultural Extention and Research. Achievements a. Problems in National Systems. Washington: The World Bank, XXI, 282 с. : с табл.
Purcell D, Anderson J. Agricultural Extention and Research: Achievements a. Problems in National Systems. Washington: The World Bank; 1997. p. XXI, 282 с. : с табл. ISBN: 0-8213-3878-1.