Lectures, V. o. A. F. (1968). The quality of man's environment. Voice of America Forum Lectures.
Lua i Stíl Chicago (17ú heag.)Lectures, Voice of America Forum. The Quality of Man's Environment. Voice of America Forum Lectures, 1968.
Lua MLA (8ú heag.)Lectures, Voice of America Forum. The Quality of Man's Environment. Voice of America Forum Lectures, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.