APA

Alex Nicholas, . (1969). Black in blue. New York: Appleton-Century Crofts.

Chicago

Alex Nicholas, . 1969. Black in blue. New York: Appleton-Century Crofts.

Harvard

Alex Nicholas, . (1969). Black in blue. New York: Appleton-Century Crofts.

MLA

Alex Nicholas, . Black in blue. New York: Appleton-Century Crofts. 1969.