Harper, K. (1991). Introduction to accounting. Pitman.
Lua i Stíl Chicago (17ú heag.)Harper, Karl. Introduction to Accounting. London: Pitman, 1991.
Lua MLA (9ú heag.)Harper, Karl. Introduction to Accounting. Pitman, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.