Hemstock, H. F., & Costelloe, P. (1969). Modern business arithmetic (3rd ed.). Nelson.
Lua i Stíl Chicago (17ú heag.)Hemstock, H. F., agus P.J Costelloe. Modern Business Arithmetic. 3rd ed. [S.l.]: Nelson, 1969.
Lua MLA (9ú heag.)Hemstock, H. F., agus P.J Costelloe. Modern Business Arithmetic. 3rd ed. Nelson, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.