Παραπομπή APA

(1968). Smithsonian year 1968: Annual report of the Smithsonian Institution for the year ended 30 June 1968. Washington: Smithsonian Institution Press.

Παραπομπή Chicago Style

Smithsonian Year 1968: Annual Report of the Smithsonian Institution for the Year Ended 30 June 1968. Washington: Smithsonian Institution Press, 1968.

Παραπομπή MLA

Smithsonian Year 1968: Annual Report of the Smithsonian Institution for the Year Ended 30 June 1968. Washington: Smithsonian Institution Press, 1968.

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