Carlson, P. A. (1925). Bookkeeping tests: Series A. South-western Publishing Co..
Lua i Stíl Chicago (17ú heag.)Carlson, Paul A. Bookkeeping Tests: Series A. Cincinnati : New York [etc.]: South-western Publishing Co., 1925.
Lua MLA (8ú heag.)Carlson, Paul A. Bookkeeping Tests: Series A. South-western Publishing Co., 1925.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.