APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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