APA (7th ed.) Citation

E. Merck AG. (1961). Index Merck (9. Aufl.).

Chicago Style (17th ed.) Citation

E. Merck AG. Index Merck. 9. Aufl. Darmstadt, 1961.

MLA (9th ed.) Citation

E. Merck AG. Index Merck. 9. Aufl. 1961.

Warning: These citations may not always be 100% accurate.