Paul, H. G., & Kincheloe, I. M. (1940). Units in English. Lyons & Carnahan.
Lua i Stíl Chicago (17ú heag.)Paul, H. G., agus Isabel Mary Kincheloe. Units in English. Chicago ; Dallas [etc.]: Lyons & Carnahan, 1940.
Lua MLA (8ú heag.)Paul, H. G., agus Isabel Mary Kincheloe. Units in English. Lyons & Carnahan, 1940.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.