Intermediate types among primitive folk; a study in social evolution
  MLA
  Carpenter, and Edward Carpenter. Intermediate Types Among Primitive Folk; a Study In Social Evolution. 1915.
  APA
  Carpenter, C., & Carpenter, E. (1915). Intermediate types among primitive folk; a study in social evolution. .
  Chicago
  Carpenter, and Edward Carpenter. Intermediate Types Among Primitive Folk; a Study In Social Evolution.