APA

Frost C., Cottingham P., United States of America. Department of the Interior & Cottingham P. (1973). Hydrogenating shale oil at low space velocity. United States of America: Bureau of Mines.

Chicago

Frost C.M, Cottingham P.L, United States of America. Department of the Interior and Cottingham P.L. 1973. Hydrogenating shale oil at low space velocity. United States of America: Bureau of Mines.

Harvard

Frost C., Cottingham P., United States of America. Department of the Interior and Cottingham P. (1973). Hydrogenating shale oil at low space velocity. United States of America: Bureau of Mines.

MLA

Frost C.M, Cottingham P.L, United States of America. Department of the Interior and Cottingham P.L. Hydrogenating shale oil at low space velocity. United States of America: Bureau of Mines. 1973.