TY  - BOOK
AU  - Heyer,W.Ronald
TI  - Measuring and monitoring biological: standard methods for amphibians 
T2  - Biological diversity handbook
SN  - 1-56098-284-5
AV  - QL645.4 M43
PY  - 1994///
CY  - Washington, D. C.
PB  - Smithsonian Institution
N1  - Incluye bibliografia
ER  -