Joint House-Senate colloquium to discuss a national policy for the environment. Hearing before the Committee on Interior and Insular Affairs, United States Senate, and the Committee on Science and Astronautics, U.S. House of Representatives, Ninetieth Congress, second session. July 17, 1968

Chicago citation style
United States. Congress. Senate. Committee on Interior and Insular Affairs. Joint House-Senate colloquium to discuss a national policy for the environment. Hearing before the Committee on Interior and Insular Affairs, United States Senate, and the Committee on Science and Astronautics, U.S. House of Representatives, Ninetieth Congress, second session. July 17, 1968. 1968. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011394937. (Accessed December 15, 2018.)
APA citation style
United States. Congress. Senate. Committee on Interior and Insular Affairs, (1968) Joint House-Senate colloquium to discuss a national policy for the environment. Hearing before the Committee on Interior and Insular Affairs, United States Senate, and the Committee on Science and Astronautics, U.S. House of Representatives, Ninetieth Congress, second session. July 17, 1968. Retrieved from the Digital Public Library of America, http://catalog.hathitrust.org/Record/011394937
MLA citation style
United States. Congress. Senate. Committee on Interior and Insular Affairs. Retrieved from the Digital Public Library of America <http://catalog.hathitrust.org/Record/011394937>.
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