Sarah J. Ashburn, David C. Eichinger, Shelly A. Witham, Vanessa D. Cross, Gerald H. Krockover, Tae-Il Pae, Samantha Islam, J. Paul Robinson
The American Biology Teacher 64 (7), 503-510, (1 September 2002) https://doi.org/10.1662/0002-7685(2002)064[0503:TBIITI]2.0.CO;2