Gaya APA
JEFFRIES, M., MILLS, D. (1990).
FRESHWATER ECOLOGY : PRINCIPLES AND APPLICATIONS .
LONDON:
THE CASTLEFIELD PRESS LTD..
Gaya MLA
JEFFRIES, MICHAEL., MILLS, DEREK.
"FRESHWATER ECOLOGY : PRINCIPLES AND APPLICATIONS".
LONDON:
THE CASTLEFIELD PRESS LTD.,
1990.
Prodi S1 PSDP.