Não informado. (1971). NLL Announcement Bulletin. National Lending Library for Science and Technology.
Citace podle Chicago (17th ed.)Não informado. NLL Announcement Bulletin. Boston, Inglaterra: National Lending Library for Science and Technology, 1971.
Citace podle MLA (8th ed.)Não informado. NLL Announcement Bulletin. National Lending Library for Science and Technology, 1971.
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