MLA

Blackensburg, Peter von. The Training and Visit System of Agricultural Extension: a Review of First Experiences. International, 1982.

APA

Blackensburg, P. von. (1982). The training and visit system of agricultural extension: a review of first experiences. International.

Chicago

Blackensburg, Peter von The Training and Visit System of Agricultural Extension: a Review of First Experiences. International, 1982.