McKee, P. (1951). Teacher's guide and key for Perfecting your language. Houghton Mifflin.
Lua i Stíl Chicago (17ú heag.)McKee, Paul. Teacher's Guide and Key for Perfecting Your Language. [Boston]: Houghton Mifflin, 1951.
Lua MLA (8ú heag.)McKee, Paul. Teacher's Guide and Key for Perfecting Your Language. Houghton Mifflin, 1951.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.