Παραπομπή σε μορφή APA (7η εκδ.)

Sigma Chemical Company. (1991). Biochemicals organic compounds for research and diagnostic reagents 1991. Sigma.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Sigma Chemical Company. Biochemicals Organic Compounds for Research and Diagnostic Reagents 1991. [St. Louis, United States of America]: Sigma, 1991.

Παραπομπή σε μορφή MLA (9th εκδ.)

Sigma Chemical Company. Biochemicals Organic Compounds for Research and Diagnostic Reagents 1991. Sigma, 1991.