Gaya APA

Gayer.R,Harris.i, . (1996). geological society special publication no. 109 Coalbed Methane and Coal Geology (E-Book) . Great Britain: The Geological Society London.

Gaya MLA

Gayer.R,Harris.i, . "geological society special publication no. 109 Coalbed Methane and Coal Geology (E-Book)". Great Britain: The Geological Society London, 1996. E-book.