Geahča maid

• Cooperative extension service.
  Dahkki: SANDERS, H.C. ed
  Almmustuhtton: (1966)
• Extension Programme Planning /
  Dahkki: Sandhu, Anoop Singh
  Almmustuhtton: (1994)
• Agricultural extension : farm extension services in Australia, Britain and the united states of America
  Dahkki: Williams, Donald B.
  Almmustuhtton: (1968)
• Performance of agricultural extension organizations of Bangladesh /
  Dahkki: Hassanullah, M.
  Almmustuhtton: (1993)
• Innovations in Rural Extension : Case Studies from Bangladesh /
  Dahkki: Mele, Paul Van
  Almmustuhtton: (2005)