Gale Research Company & Dresser, P. D. (1989). New research centers: The supplement to the 13th edition of research centers directory. Gale Research Company.
Citace podle Chicago (17th ed.)Gale Research Company a Peter D. Dresser. New Research Centers: The Supplement to the 13th Edition of Research Centers Directory. Detroit: Gale Research Company, 1989.
Citace podle MLA (9th ed.)Gale Research Company a Peter D. Dresser. New Research Centers: The Supplement to the 13th Edition of Research Centers Directory. Gale Research Company, 1989.
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