Gaya APA

Ahrens, A. (2006). Hazardous Chemicals in Products and Processes : Substitution as an Innovative Process . Bremen: Physica-Verlag Heidelberg.

Gaya MLA

Ahrens, Andreas. "Hazardous Chemicals in Products and Processes : Substitution as an Innovative Process". Bremen: Physica-Verlag Heidelberg, 2006. Text.