TY  - BOOK
AU  - Tribe,Michael A.
AU  - Eraut,Michael
AU  - Snook,Roger K.
TI  - Ecological principles
SN  - 0521206588
PY  - 1975///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Ecology
KW  - Programmed instruction
N1  - Includes bibliographies ( p. 158) and index
ER  -