Cita APA (7a ed.)

(1975). Seaborne trade in phosphate rock and phosphoric acid up to 1980. London : Westinform.

Cita Chicago Style (17a ed.)

Seaborne Trade in Phosphate Rock and Phosphoric Acid Up to 1980. London : Westinform, 1975.

Cita MLA (8a ed.)

Seaborne Trade in Phosphate Rock and Phosphoric Acid Up to 1980. London : Westinform, 1975.

Cita IICA/CATIE

1975. Seaborne trade in phosphate rock and phosphoric acid up to 1980. London : Westinform.