Παραπομπή APA

Raistric, A. (1939). Nature and origin of coal and coal seams. The English University press.

Παραπομπή Chicago Style

Raistric, A. Nature and Origin of Coal and Coal Seams. LOndon: The English University press, 1939.

Παραπομπή MLA

Raistric, A. Nature and Origin of Coal and Coal Seams. The English University press, 1939.