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How to cite using APA in the Health Sciences

The Merck Index Online

Elements for a Chemical Monograph

Author. (Date). Title of entry. In Merck Online Index. Retrieved date, from log-in URL 

Example 

Merck & Co., Inc. (n.d.). Vanilmandelic acid. In Merck Index Online. Retrieved April 17, 2024, from https://merckindex-rsc-

org.uml.idm.oclc.org/

Formatting Tips

  • The Merck Online Index is treated like an online encyclopedia.
  • Author: Merck & Co., Inc. is the owner of the Merck Online Index, so name them as the author.
  • Date: Sometimes the updated/published dates are not available for information in the Merck Online Index. If this is the case, substitute “(n.d.).”
  • Title: Provide the title of the chemical/drug/biologicals information in italic sentence case.
  • Source: Provide "Merck Index Online" as the database source.
  • Include a retrieval date because the content is designed to change over time and versions of the page are not archived.
  • Provide a URL for the drug information. Do not add a period at the end.

Sentence Case and Title Case

What is the difference between sentence and title case? Find out in Formatting Tips.

Missing Information?

Don't leave it blank! Find out how to properly indicate that information is missing from one of your reference elements by reading more about missing information.

Acknowledgement

Information on this page was adapted from "Chapter 10: Reference List", in the Publication Manual of the American Psychological Association (7th ed.), as well as the APA webpage, "Reference Lists".