Centre for Industrial Development (United Nations). (1967). Fertilizer manual. United Nations.
Cita Chicago (17th ed.)Centre for Industrial Development (United Nations). Fertilizer Manual. New York: United Nations, 1967.
Cita MLA (9th ed.)Centre for Industrial Development (United Nations). Fertilizer Manual. United Nations, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.