APA

Gal N. P., American Petroleum Institute A. & Gal N. P. (1984). Capital expenditures of leading petroleum companies 1968-1982. Washington: American Petroleum Institute, API.

Chicago

Gal Nicholas P, American Petroleum Institute API and Gal Nicholas P. 1984. Capital expenditures of leading petroleum companies 1968-1982. Washington: American Petroleum Institute, API.

Harvard

Gal N. P., American Petroleum Institute A. and Gal N. P. (1984). Capital expenditures of leading petroleum companies 1968-1982. Washington: American Petroleum Institute, API.

MLA

Gal Nicholas P, American Petroleum Institute API and Gal Nicholas P. Capital expenditures of leading petroleum companies 1968-1982. Washington: American Petroleum Institute, API. 1984.