Sigma-Aldrich Corporation. (1999). [Biochemicals and reagents: For life science research. Sigma Chemical Company.
Cita Chicago Style (17a ed.)Sigma-Aldrich Corporation. [Biochemicals and Reagents: For Life Science Research. Saint Louis [Estados Unidos]: Sigma Chemical Company, 1999.
Cita MLA (8a ed.)Sigma-Aldrich Corporation. [Biochemicals and Reagents: For Life Science Research. Sigma Chemical Company, 1999.
Precaución: Estas citas no son 100% exactas.