Annual report = "Annual report"
BIBB Discussion Paper = "BIBB Discussion Paper"
Bibliography  = "Bibliography"
Conference proceedings = "Conference proceedings"
DVD = "DVD"
E-Book = "eBook"
Educational material = "Educational material"
Governmental paper = "Governmental paper"
Grey Literature = "Grey Literature"
Interview = "Interview"
Manual/ Reference Book = "Manual/ Reference Book"
Preprint = "Preprint"
Presentation = "Presentation"
Research data = "Research data "
Research paper = "Research paper"
Research report = "Research report"
Review = "Review"
Study = "Study"
Thesis = "Thesis"
Working paper = "Working paper"