California (Southern) University. National Center for Educational Media. (1969). Index to overhead transparencies. R.R. Bowler.
Chicago-referens (17:e uppl.)California (Southern) University. National Center for Educational Media. Index to Overhead Transparencies. New York: R.R. Bowler, 1969.
MLA-referens (9:e uppl.)California (Southern) University. National Center for Educational Media. Index to Overhead Transparencies. R.R. Bowler, 1969.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.