Rules for writers, Tenth edition - Diana Hacker, Nancy Sommers 2021

Plural of abbreviations
Abbreviations
Mechanics

To form the plural of most abbreviations, add -s, without an apostrophe: PhDs, DVDs. Do not add -s to indicate the plural of units of measurement: mm (not mms).

EXERCISE 41-1

Edit the following sentences to correct errors in abbreviations. If a sentence is correct, write “correct” after it. Answers appear in the back of the book.

a. Since its inception, the BBC has maintained a consistently high standard of radio and television broadcasting.

b. All of the students must meet with the prof. to discuss their final projects.

c. Mahatma Gandhi has inspired many modern leaders, including Martin Luther King Jr.

d. A gluten-free diet is not always the best strategy for shedding lbs.

e. The work of Dr. Anand Khan, PhD, has helped practitioners better understand post-traumatic stress.