Gilpin, P. J., & Gasman, M. (2003). Charles S. Johnson: Leadership beyond the veil in the age of Jim Crow. State University of New York Press.
Lua i Stíl Chicago (17ú heag.)Gilpin, Patrick J., agus Marybeth Gasman. Charles S. Johnson: Leadership Beyond the Veil in the Age of Jim Crow. Albany: State University of New York Press, 2003.
Lua MLA (9ú heag.)Gilpin, Patrick J., agus Marybeth Gasman. Charles S. Johnson: Leadership Beyond the Veil in the Age of Jim Crow. State University of New York Press, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.