TY  - BOOK
AU  - Tribe,Michael A.
AU  - Eraut,Michael
AU  - Snook,Roger K.
TI  - Ecological principles / 
T2  - Basic biology course ; 
SN  - 0521206588
U1  - 574.5 
PY  - 1975///
CY  - Cambridge : 
PB  - Cambridge University Press, 
KW  - Ecologia
KW  - Ensino programado
ER  -