Parmer, J. N., Finkelstein, M., & Stephen, R. M. (1978). People and progress: A global history. Laidlaw Bros..
Lua i Stíl Chicago (17ú heag.)Parmer, J. Norman, Milton Finkelstein, agus Robert M. Stephen. People and Progress: A Global History. River Forest, Ill.: Laidlaw Bros., 1978.
Lua MLA (8ú heag.)Parmer, J. Norman, et al. People and Progress: A Global History. Laidlaw Bros., 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.