Gaya APA
ARMSTEAD, H, C, H.
(1983).
Geothermal energy:
(
2nd ed.)
.
London:
E. & F.N. Spon.
Gaya MLA
ARMSTEAD, H., Christopher, H..
"Geothermal energy:".
2nd ed.
London:
E. & F.N. Spon,
1983.
Text.