Author
Films for the Humanities & Sciences (Firm)
8
Infobase
8
Canadian Broadcasting Corporation
2
ABC News Productions
1
Cambridge Educational (Firm)
1
EBS Trust (Firm)
1
Fred Friendly Seminars (Firm)
1
MacNeil/Lehrer Productions
1
Meridian Education Corporation
1
United States. Congress. House. Committee on Science, Space, and Technology (2011- ),
1