India. Coal Board. Publication and Statistics Wing. Coal directory of India. Publication and Statistics Wing, Coal Board.
Chicago-referens (17:e uppl.)India. Coal Board. Publication and Statistics Wing. Coal Directory of India. Calcutta: Publication and Statistics Wing, Coal Board.
MLA-referens (8:e uppl.)India. Coal Board. Publication and Statistics Wing. Coal Directory of India. Publication and Statistics Wing, Coal Board.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.