Gaya APA

Barra, R, H., Transport, T. (). The Transportation Of U.S Coals For Export Via Electro-Coal Transfer . Tokyo: Pusat Sumber Daya Geologit.

Gaya MLA

Barra, Robert, H.., Transport, Teco. "The Transportation Of U.S Coals For Export Via Electro-Coal Transfer". Tokyo: Pusat Sumber Daya Geologit, . Batubara.