Gaya APA

Stach, P, D, E. et al (1975). Stach's Textbook of Coal Petrology second completely revised edition (1). germany: Gebruder Borntraeger, Berlin, Stuttgrart..

Gaya MLA

Stach, Prof., Dr., E.. et al. "Stach's Textbook of Coal Petrology second completely revised edition". 1 germany: Gebruder Borntraeger, Berlin, Stuttgrart., 1975. Text.