Note the differences in the annotated bibliographies below. The differences are not because of the different requirements of different citation styles, but are just examples of the different ways you can write an annotated bibliography.
How much to include in your annotated bibliography is up to you as the writer, but keep in mind that the information included should be helpful to both you and to potential readers. If you're writing an annotated bibliography for a class, you should get specific guidelines from your instructor.
From Purdue OWL:
Lamott, Anne. Bird by Bird: Some Instructions on Writing and Life. Anchor Books, 1995.
From Purdue OWL:
Davidson, Hilda Ellis. Roles of the Northern Goddess. London: Routledge, 1998.
From Purdue OWL:
Ehrenreich, B. (2001). Nickel and dimed: On (not) getting by in America. New York: Henry Holt and Company.