In research, secondary sources are those that interpret, analyze, or summarize primary sources. Here are the sources listed and their classifications:
- a book about Ball’s impact as a performer - Secondary source (analyzes and interprets Ball's work)
- a television interview with Ball - Primary source (an original interview with the subject)
- one of Ball’s acceptance speeches - Primary source (original speech by Ball)
- a review of Ball’s television show - Secondary source (analyzes the show)
- a chapter from Ball’s autobiography - Primary source (original writing by Ball)
- an interview with Ball’s costars - Primary source (original interviews with associates of Ball)
So, the secondary sources are:
- a book about Ball’s impact as a performer
- a review of Ball’s television show