The Associated Press Stylebook Quotes

“Use an apostrophe in bachelor’s degree, a master’s, etc., but there is no possessive in Bachelor of Arts or Master of Science.”
― The Associated Press, The Associated Press Stylebook 2019

“If mention of degrees is necessary to establish someone’s credentials, the preferred form is to avoid an abbreviation and use instead a phrase such as: John Jones, who has a doctorate in psychology.”
― The Associated Press, The Associated Press Stylebook 2019