References
- CRELLIN , J. R. 1978 . Environmental measurement in schools: electronics in field studies . Journal of Biological Education , 12 ( 3 ) : 190 – 198 .
- DAVIES , D. W. 1962 . “ The oxygen electrode ” . In Physical Techniques in Biological Research , Edited by: Nastuk , W. L. Vol. 4 , 137 – 179 . New York : Academic Press .