APA
Brown R. W., . (1921). The writer's art by those who have practiced it. Cambridge: Harvard University Press; [etc., etc.].
Chicago
Brown Rollo Walter, . 1921. The writer's art by those who have practiced it. Cambridge: Harvard University Press; [etc., etc.].
Harvard
Brown R. W., . (1921). The writer's art by those who have practiced it. Cambridge: Harvard University Press; [etc., etc.].
MLA
Brown Rollo Walter, . The writer's art by those who have practiced it. Cambridge: Harvard University Press; [etc., etc.]. 1921.