Franklin

MLA

Derz, F., and Friedrich W Derz. Chemsuppliersdirectory. Reprint 2019. .

APA

Derz, F., & Derz, F. W. ChemSUPPLIERSdirectory. Reprint 2019. .

Chicago

Derz, F., Friedrich W. Derz, and Friedrich W. Derz. Chemsuppliersdirectory. Reprint 2019.