McKee, P. (1951). Teacher's guide and key for Perfecting your language. Houghton Mifflin.
Chicago-referens (17:e uppl.)McKee, Paul. Teacher's Guide and Key for Perfecting Your Language. [Boston]: Houghton Mifflin, 1951.
MLA-referens (8:e uppl.)McKee, Paul. Teacher's Guide and Key for Perfecting Your Language. Houghton Mifflin, 1951.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.