Gaya APA

[et.al], S, S, .. (2004). The Economics of energy efficieancy : barriers to cost-effective invesment . Cheltenham,UK: Edward Elgar Pub.

Gaya MLA

[et.al], Steve, Sorrell, .... "The Economics of energy efficieancy : barriers to cost-effective invesment". Cheltenham,UK: Edward Elgar Pub, 2004. Text.