Coppen, H. (1972). Survey of British research in audio-visual aids, 1945-1971. National Council for Audio Visual Aids in Education.
Chicago Edition CitationCoppen, Helen. Survey of British Research in Audio-visual Aids, 1945-1971. London: National Council for Audio Visual Aids in Education, 1972.
MLA Edition CitationCoppen, Helen. Survey of British Research in Audio-visual Aids, 1945-1971. National Council for Audio Visual Aids in Education, 1972.
Warning: These citations may not always be 100% accurate.