(1973). Smithsonian year 1973: Annual report of the Smithsonian Institution for the year ended 30 June 1973. Washington: Smithsonian Institution Press.
Παραπομπή Chicago StyleSmithsonian Year 1973: Annual Report of the Smithsonian Institution for the Year Ended 30 June 1973. Washington: Smithsonian Institution Press, 1973.
Παραπομπή MLASmithsonian Year 1973: Annual Report of the Smithsonian Institution for the Year Ended 30 June 1973. Washington: Smithsonian Institution Press, 1973.
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