APA

(2007). Teri Energy Data Directory & Yearbook 2005/2006. : .

Chicago

2007. Teri Energy Data Directory & Yearbook 2005/2006. : .

Harvard

(2007). Teri Energy Data Directory & Yearbook 2005/2006. : .

MLA

Teri Energy Data Directory & Yearbook 2005/2006. : . 2007.