Gaya APA
Letcher, T, M. (2008).
FUTURE ENERGY IMPROVED, SUSTAINABLE AND CLEAN OPTIONS FOR OUR PLANET .
Amsterdam:
Elsevier.
Gaya MLA
Letcher, Trevor, M..
"FUTURE ENERGY IMPROVED, SUSTAINABLE AND CLEAN OPTIONS FOR OUR PLANET".
Amsterdam:
Elsevier,
2008.
Textbook.