SPECTHRIE, S. (1959). Industrial Accounting S.W Specthrie. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)SPECTHRIE, S.W. Industrial Accounting S.W Specthrie. Prentice-Hall, 1959.
Lua MLA (8ú heag.)SPECTHRIE, S.W. Industrial Accounting S.W Specthrie. Prentice-Hall, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.