Lua APA (7ú heag.)

Keefe, E. K. (1974). Area handbook for Bulgaria. U.S. Government Printing Office.

Lua i Stíl Chicago (17ú heag.)

Keefe, Eugene K. Area Handbook for Bulgaria. Washington, D.C: U.S. Government Printing Office, 1974.

Lua MLA (9ú heag.)

Keefe, Eugene K. Area Handbook for Bulgaria. U.S. Government Printing Office, 1974.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.