Ellis, S. J., & Noyes, K. H. (1990). By the people: A history of Americans as volunteers (Rev.ed.). Jossey-Bass.
Lua i Stíl Chicago (17ú heag.)Ellis, Susan J., agus Katherine H. Noyes. By the People: A History of Americans as Volunteers. Rev.ed. San Francisco: Jossey-Bass, 1990.
Lua MLA (9ú heag.)Ellis, Susan J., agus Katherine H. Noyes. By the People: A History of Americans as Volunteers. Rev.ed. Jossey-Bass, 1990.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.