Kahn, G., Yerian, C. T., & Stewart, J. R. (1961). Progressive filing (7th ed.). Gregg Pub. Division, McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Kahn, Gilbert, C. Theo Yerian, agus Jeffrey Robert Stewart. Progressive Filing. 7th ed. New York: Gregg Pub. Division, McGraw-Hill, 1961.
Lua MLA (8ú heag.)Kahn, Gilbert, et al. Progressive Filing. 7th ed. Gregg Pub. Division, McGraw-Hill, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.