Cita APA (7a ed.)

Alex, N. (1969). Black in blue: A study of the Negro policeman. Appleton-Century Crofts.

Cita Chicago Style (17a ed.)

Alex, Nicholas. Black in Blue: A Study of the Negro Policeman. New York: Appleton-Century Crofts, 1969.

Cita MLA (9a ed.)

Alex, Nicholas. Black in Blue: A Study of the Negro Policeman. Appleton-Century Crofts, 1969.