Παραπομπή APA

Longley, R. (1991). Petrochemicals: An industry and its future. London: Economist Intelligence Unit.

Παραπομπή Chicago Style

Longley, Roger. Petrochemicals: An Industry and Its Future. London: Economist Intelligence Unit, 1991.

Παραπομπή MLA

Longley, Roger. Petrochemicals: An Industry and Its Future. London: Economist Intelligence Unit, 1991.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.