Show Summary Details
Page of



Brenda Gregoline

Page of

PRINTED FROM AMA MANUAL OF STYLE ONLINE ( © American Medical Association, 2009. All Rights Reserved. Under the terms of the license agreement, an individual user may print out a PDF of a single chapter of a title in AMA Manual of Style Online for personal use (for details see Privacy Policy and Legal Notice).

date: 28 January 2020

For most all-capital abbreviations, the plural is formed by adding s. Do not use an apostrophe before the s. (See also , Punctuation, Apostrophe, Using Apostrophes to Form Plurals.) Note: When plural all-capital-letter abbreviations are found in an all-capital setting, such as a first-level heading, the plural s is still lowercase.REFERRAL PATTERNS IN MIDWESTERN HMOs

Access to the complete content on AMA Manual of Style requires a subscription or purchase. Public users are able to search the site without a subscription.

Please subscribe or login to access full text content.

If you have purchased a print title that contains an access token, please see the token for information about how to register your code.

For questions on access or troubleshooting, please check our FAQs, and if you can't find the answer there, please contact us.