Gaya APA
Twidell, J., Weir, T.
(2015).
Renewable energy resources
(
3rd ed.)
.
Oxon:
Routledge.
Gaya MLA
Twidell, John., Weir, Tony.
"Renewable energy resources".
3rd ed.
Oxon:
Routledge,
2015.
Text.