Pirtle, W. G., & Grant, J. J. (1972). The social sciences: An integrated approach. Random House.
Lua i Stíl Chicago (17ú heag.)Pirtle, Wayne G., agus John J. Grant. The Social Sciences: An Integrated Approach. New York: Random House, 1972.
Lua MLA (9ú heag.)Pirtle, Wayne G., agus John J. Grant. The Social Sciences: An Integrated Approach. Random House, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.