Cita APA (7th ed.)
Smithsonian Institution Symposium (16-18 feb. l967). (1968). The quality of man's environment. Voice of American Forum Lectures.
Cita Chicago (17th ed.)
Smithsonian Institution Symposium (16-18 feb. l967). The Quality of Man's Environment. United States: Voice of American Forum Lectures, 1968.
Cita MLA (9th ed.)
Smithsonian Institution Symposium (16-18 feb. l967). The Quality of Man's Environment. Voice of American Forum Lectures, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.