Gaya APA
POEHLS, D, :, S, G.
(2009).
Encyclopedic Dictionary of Hydrogeology
.
:
Elsevier.
Gaya MLA
POEHLS, D.J., :, SMITH,, Gregory.
"Encyclopedic Dictionary of Hydrogeology".
:
Elsevier,
2009.
Buku.