Teggart, F. J., & Bock, K. (1977). Theory and processes of history (Second pbk. edition.). University of California Press.
Lua i Stíl Chicago (17ú heag.)Teggart, Frederick J., agus Kenneth Bock. Theory and Processes of History. Second pbk. edition. Berkeley: University of California Press, 1977.
Lua MLA (8ú heag.)Teggart, Frederick J., agus Kenneth Bock. Theory and Processes of History. Second pbk. edition. University of California Press, 1977.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.