Barman, Charles R. (1984). "Slide-Tape Presentations on a Classroom Budget". The American Biology Teacher. University of California Press. 46 (6): 344–346. doi:10.2307/4447864. JSTOR4447864.
jstor.org
Barman, Charles R. (1984). "Slide-Tape Presentations on a Classroom Budget". The American Biology Teacher. University of California Press. 46 (6): 344–346. doi:10.2307/4447864. JSTOR4447864.