Spell out and use lowercase: associate degree, bachelor’s degree, master’s degree, doctor’s degree or doctorate. (Note: You can receive a doctorate or a doctor’s degree but not a doctoral degree.)
In general, avoid using degree abbreviations in text unless you are describing the credentials of specific alumni. To abbreviate, capitalize each letter and follow it with a period: B.A., B.F.A., B.I.S., J.D., M.P.H., M.S., M.S.W., M.S.I.A. and so on. There are exceptions, such as LL.M., MBA, M.Ed. and Ph.D.
Right: Two years after earning an associate of arts degree through Perimeter College, he graduated from the Atlanta Campus with a bachelor’s degree in education.
Right: She received her master of science degree in biology.
Right: We awarded 99 doctor’s, 150 master’s and 900 bachelor’s degrees.
Right: He earned a bachelor of music degree.
Wrong: She has a B.F.A. in creative writing.
Wrong: He earned a bachelor’s of anthropology.