APA

Guerrieri U., American Petroleum Institute A. & Guerrieri U. (1985). Petroleum imports and national security. Washington: American Petroleum Institute, API.

Chicago

Guerrieri Ursula, American Petroleum Institute API and Guerrieri Ursula. 1985. Petroleum imports and national security. Washington: American Petroleum Institute, API.

Harvard

Guerrieri U., American Petroleum Institute A. and Guerrieri U. (1985). Petroleum imports and national security. Washington: American Petroleum Institute, API.

MLA

Guerrieri Ursula, American Petroleum Institute API and Guerrieri Ursula. Petroleum imports and national security. Washington: American Petroleum Institute, API. 1985.