Porter, D. V. (1991). L-tryptophan: Health problems, production and regulatory status : proceedings of a CRS seminar. Congressional Research Service, Library of Congress.
Chicago Style (17th ed.) CitationPorter, Donna Viola. L-tryptophan: Health Problems, Production and Regulatory Status : Proceedings of a CRS Seminar. [Washington, D.C.]: Congressional Research Service, Library of Congress, 1991.
MLA (9th ed.) CitationPorter, Donna Viola. L-tryptophan: Health Problems, Production and Regulatory Status : Proceedings of a CRS Seminar. Congressional Research Service, Library of Congress, 1991.
Warning: These citations may not always be 100% accurate.