APA (7th ed.) Citation

Shell Chemical Company & Purchas, D. (1989). Chemical processing technology international 1989-90. Cornhill Publications Ltd..

Chicago Style (17th ed.) Citation

Shell Chemical Company and Derek Purchas. Chemical Processing Technology International 1989-90. London: Cornhill Publications Ltd., 1989.

MLA (9th ed.) Citation

Shell Chemical Company and Derek Purchas. Chemical Processing Technology International 1989-90. Cornhill Publications Ltd., 1989.