Gaya APA

-, . (-). Dr. B. C. Roy, Dr. Ing. (Freiberg), D. I. C., M. Sc. (London), A.I.S.M., F.N.I., Director General, Geological Survey of India . : .

Gaya MLA

-, . "Dr. B. C. Roy, Dr. Ing. (Freiberg), D. I. C., M. Sc. (London), A.I.S.M., F.N.I., Director General, Geological Survey of India". : , -. Text.